So built into the mod is a Player and Tamed Dino Weight Buff of a 75% Weight Reduction
This means items will show a lesser weight only in these inventories, not in storage structures.

As well I personally use ARK's Built in Stack Multiplier setting in the GUS.INI

This is because a mod is not needed, as well its setting applies to ALL items even modded.
Its draw back is if an ARK item has a 1 stack like Wyvern milk, it stays a 1 stack.
But this can be negated via GAME.INI settings


EXAMPLE FOR GUS.INI
"ItemStackSizeMultiplier=xxxx"
Example is say Stack of 100 metal with a "=20" setting would be a stack of 2000

EXAMPLE OF GAME.INI
ConfigOverrideItemMaxQuantity=(ItemClassString="PrimalItemConsumable_WHATEVER_C",Quantity=(MaxItemQuantity=75,bIgnoreMultiplier=true))

MaxItemQuantity=75 meaning that item would be set at a stack of 75
bIgnoreMultiplier=true meaning it will ignore the ItemStackSizeMultiplier= setting

OR

ConfigOverrideItemMaxQuantity=(ItemClassString="PrimalItemConsumable_WHATEVER_C",Quantity=(MaxItemQuantity=10,bIgnoreMultiplier=false))

with ItemStackSizeMultiplier=2 - that item will be stacks of 20 (10x2=stack size)

I hope this makes sense lol, please feel free to hit up my Discord for real time help or discussion about it !