My base premises
I like the dodge proposal.
I like the PRR proposal.
I don't care for the AC & to-hit proposal at all.
I stopped playing Savage2 for DDO, because I like active combat.
Suggestion
Make AC a bonus to PRR of the armor being worn. This would result in potentially very high PRR ratings, but that's okay.
On a physics collision, that bonus would be decreased by the attackers to-hit + d20. A roll of 1 would still be a miss.
Get rid of grazing hits! They are unnecessary now as AC+PRR provide the exact same mechanic.
Why I like this suggestion
AC issues solved with PRR.
Better Armor is more PRR & more mitigation.
Higher AC is more potential mitigation, but not invulnerability.
To-hit scores directly bypass AC with no complex math necessary.