Unfortunately the valve convers prevent getting a true 90* at bump with out the motor being pushed way back . Which I'm not willing to do for the measly 200hp stock motor I have. That's a project for another time.Springs are position progressive yes.
BP's are position progressive yes.
Valve stacks are speed progressive yes.
Keeping it at 90/bumped will make less work for the shocks. If your on a keystone budget, good geometry can go a long way to compensating for small shocks.