I don't have pastebin pro account but I can upload log file to another site.
After your last update I was able to play 4 missions in a row but it crashed at loading 5th mission(didn't count missions so I guess it was like that). Log file here.[www20.zippyshare.com]
I just started playing again and this time it crashed at the end of first mission. Log file here.[www20.zippyshare.com]
After disabling this mod these lines you can see in the log files I provided never appear in the crash log and game doesn't crash :

[12776.18] Log: World AVG_ProvingGrounds_A.TheWorld not cleaned up by garbage collection! trying again
[12776.18] Log: World AVG_Landing_Arid_D.TheWorld not cleaned up by garbage collection!
trying again

Can you also upload a list with all mods you're using?

Sure, here you go:

Missing Packages Fix + Resource
X2WOTCCommunityHighlander
[WotC] Mod Config Menu
WOTC Save Games Delete All Option
[WOTC] Extended Perk Pack
[WOTC] LW2 Classes and Perks
SWR Full Crew Avenger WotC
Stop Wasting My Time - WotC
Instant Avenger Menus - WotC
WOTC - Extended Information!
[WotC] Gotcha Again
Tactical Information Overhaul [WOTC]
WotC Enhanced AoE Preview
[WOTC] Quick Soldier Info
[WOTC] LifetimeStats
[WotC+Classic] TacticalUI KillCounter
WotC: Show Will Loss
Pyrrhic Victories
A Better ADVENT: War of the Chosen
A Better Campaign PLUS
Evac All - WotC
Overwatch All/Others WotC
WotC: robojumper's Squad Select
WOTC Show Enemies and Terrain on Mission Planning
Ammo and Vest Slots [WOTC]
Row-Based Scrolling Speed Wotc
[WOTC/TLP] Configurable Loot Timer
[WotC] Instant Loot
Starting Staff - WotC + Vanilla
[WotC] I'm the Commander here
[WotC] I'm the Commander here Extension
[WOTC] Fair Lost Targeting
Lost Spawn Further Away
Rend The Lost
Bullpups Use Rifle Range Table
Hack Plus - WotC
Dont Unequip
Ultimate Workshop Reloaded WOTC
WotC Stealth Overhaul
WotC Tactical Suppressors
Primary Secondaries
[WOTC] LW2 Secondary Weapons
[WOTC] Dual Wielded Pistols
WotC Katana Pack Reloaded
WotC Combat Knives
Dual Wield Melee
Psionic Melee
[WOTC] Jet Packs by Iridar
WotC Ballistic Shields
[WoTC]Tier III Grenades
Add Part Names
Invisible Heads
[WOTC] Invisible Parts For Hero Units
Empty WOTC Deco Slots for XCOM Soldiers (+ Some other empty things)
No Invisible Heads On Randoms
One Million Colours
One Million Colours Plugin For WOTC
WotC: Skyranger Skins
Skyranger Skins Decal Pack
SkyrangerSkins_RPL
[WotC] Expanded Callsigns and Nicknames
More Cities WotC
WOTC Shepard Squadmate
Commander Shepard Voice Pack (Scourge's Edition) [WotC Compatible]
[WOTC] Metal Gear Raiden Customization Pack
Raiden Voice Pack
Hyperdimension Neptunia Headhelmets
Hyperdimension Neptunia - Neptune Voice Mod
Hyperdimension Neptunia Nepgear Voice Pack
Hyperdimension Neptunia Noire Voice Pack
[WotC] CX DoomGuy / DoomChick (Doom2016)
Venom Snake and Quiet Voice Pack
[WotC] CX MarvelPacks Ironman
Arkham Batman Voicepack
[WotC] Overwatch Mercy Squadmate
Overwatch - Mercy Voice Pack
WidowMaker SquadMate [WotC]
Overwatch - Widowmaker Voice Pack
(N:A) NieR: Automata – 2B’s Outfit [WOTC]
NieR: Automata - A2 & 2B Hair & Headband [WOTC]
Nier Automata 2B Voicepack
[WotC] Overwatch: Genji - Squadmate
OVERWATCH: MULTI-VOICE SIXPACK #1 [WOTC]
WOTC Portal 2 Wheatley Voice Pack - WTR
WOTC Portal 2 GLaDOS Voice Pack
Adam Jensen Voice Pack
Megatron Voice Pack
Optimus Prime Voicepack
Capnbubs Accessories - WotC
[WotC] Titanfall Gear [Dead]
XXL Tattoo - War of the Chosen
[Wotc] Halo Customizable Armors
Stenchfury Modular Helmets WOTC
Stenchfury Modular Armors WOTC
WA'sCustomGearWOTC
Skirmisher Cape
[WOTC] Titanfall Sparks
RAGE Helmet[WOTC Compatible now]
Eric Cartman Voice Pack (WotC)
[WOTC] Mechatronic Warfare: Total SPARK Overhaul
[WOTC] Additional Soldier Console Commands
Biotic Class Redux
WotC Infiltrator
WotC Samurai Class
[WOTC] Pharmacist Class
WOTC Tank Class
[WOTC] Iridar's Akimbo Class
[WotC] The Valkyrie Class Mod
Musashis RPG Overhaul
RPG Overhaul Specialization Pack - Biotics
RPG Overhaul - Infiltrator Specialization
RPG Overhaul Specialization Samurai
RPG Overhaul - Pharmacist Class Specializations
RPG Overhaul - Tank Class Specializations
RPG Overhaul Specialization Pack - Akimbo
[RPGO] The Valkyrie Specialization
RPG Overhaul - Psionic Specializations
RPG Overhaul Specialization Officer
RPG Overhaul - TacFor Class Pack Specializations
RPG Overhaul - The New Perk Order

That's a lot of mods. Hard to tell what else might be causing problems here. I've asked on the modding discord and there don't seem to really be any useful clues in these logs, much less ones pointing to this mod as the culprit. The only thing this mods it adds are a few perks and these shouldn't cause these types of errors. I'll keep looking for a bit but without more clues, I can't do much.

Okay, I understand. I tried looking to logs too but these logs don't provide anything useful about this. Thanks for trying anyway. I will try it again if you update the mod in the future. For now it's disabled.

Something for the devs:
Uses XModBase 2.0.1

Could it be upgraded to 2.0.2 or later? Otherwise this mod will be undoing a Highlander fix:
https://x2communitycore.github.io/X2WOTCCommunityHighlander/tactical/GetStatModifiersFixed/