A21 vehicle repair amount

[Tomojk]

i fell like in A21 vehicle take so much damage from impact expecialy in burnt forest and city area where is full of pavements and steps, i don't find a way to reduce damage taken but i can increase the max durability of vehicle but the problem is that repair kit only restore 1000 and i don't find the xml where i can increase the repair amount of it on vehicle, pls someone help me, i even thinked of increasing the buff of groovemonkey perk that should increase the efficency of repairing vehicle but nothing... i don't find the buff/passive to modify for that action, probably both are togheter somewhere and i don't find them, someone know where it is?