I'm iffy on the Grenadier faust range increase as the ability works within 30 range. Maybe recharge or cost, but not range.
Unfortunately, the buffing frontal armour alone if not an option in the editor as of now or that I know of. It's just a flat increase to all sides. Mobility I think is fine where it is for non-turreted TDs as they're not meant to be particularly mobile or fast to begin with at veterancy generally is not to compensate for a unit's weakness.
Vet 1 turret lock is good enough for a StuG. Armour could maybe use a higher boost, though given the StuG in general, it would only help vs mediums.
IF I am not mistaken Faust range 30 is the max Range meaning that the weapon will not be fired if the vehicles moves more than 30 units away...
The actual range of the ability is close to the minimum rifle grande range thus around 15-20...
Speaking of faust pls change the requirements (for grenadier at least) because it requires T1 building existing and is one of the few (if not the only) tech that can be lost...
Ostheer veterancy bonus increases survive-ability for vehicles at vet 2 which translates to Armour boost for tanks.
Unturreted vehicles benefit less from armor boost and more by the mobility boost, currently coming at vet 3, so switching placed veterancy bonuses of vet 3 to vet2 and vice versa makes sense for this type of units.