I've actually been looking into the same. I think i've sorted it by changing using the settings in parados, its on their site. (Move damage and health down to .92, its what i'm trying)

[Parados]
EnableStatMod=False (Set to true to enable the following options)
HealthMod=1
StamMod=1
WeightMod=1
DamageMod=1
SpeedMod=1
CraftMod=1
Foodmod=1
TorpMod=1

– Default values are 1, increasing it will increase the stats, both wild and tamed. Numbers are multiplied. Max is 1000.
– StatMod is an older system for controlling stats. It might not work on all dinos, so use at your own risk.

What I'd like is a way to bump up the percentage of Pug spawns vs the parados ones. Any clue?

Could use simple spawners, its another mod. You can setup spawn locations, etc