modules and Skills/perks makes difference?
My Favourites on Premium line tanks are,
Pz.Kpfw. 38H 735 (f),T14, T-127, Churchill III, Matilda IV and
LPT (NEW gift).
Regular tanks, Tier 1 all but not Leichtraktor(use those tanks just boosting win/lose ratio), M5 Stuart, T57(after arty Nerf this is painfull), M5A1 Stuart, AMX40.
(for testing I ofc use other tanks but these come up first)
Those are most Botted and best results comes with churchill III + Matilda IV, those tanks are also quite cheap, I must say that my tanks are scattered on several account (I will not specify that

).
Settings are Default Battle Tank and Defaul Targetting for the Tanks, for Arty I use Arty/Arty. (current versions make little difference, but hope Aevitas will make difference)
Modules selected what I think benefits botting, (per tank it depends what it can have)
Coated Optics
Improved Ventilation
Enhanced Gun Laying Drive
Spall Liner
GunRammer
Crew skills/perks selected, for lights first is Camo and second Brothers in Arm, for heavies repair/firefighting, for all Dead eye.
Win/Lose ratio is not needed here, we all know that it can be anything between 0 - 100%,

.
I think that you can make big difference when you have good modules and skills/perks for Bot because we cant other way affect Bot performance currently (ofc, we RANT that Aevitas make it better but even then...).
Interested to see what others think and what they have...