1 Hit damage is scaled by angle of impact, so glancing blows do much less. There is also a minimum impact amount, below which there is no damage.
2 I, not Steve talked about that. Chain on bike is the only disappearing part. Moving very slow without gas or at 0 health is the same as A20. No one seems to know that as they never got their vehicles to 0 health!
3 Probably, but I don't know when that will get added.
Damage numbers were not changed. That is how they currently are. The damage scaling is easy change by us and like many things, we will adjust it as necessary to achieve the balance we want.