100 Watts Solar with Deep Cell 31s or Trojan 6 Volts

I meant - to get to Bulk/Absorption transition, or Absoprtion voltage, whatever.

Yes, it's better if it not just gets to Abs point, but also completes the prescribed stay at this voltage, timer-based or current-based. In my system it goes to Float very soon after it has reached Abs voltage, timer is seldom triggered, so to me "getting to Abs" and "getting to Float" is almost the same. OP will probably get some PWM, so it will be a little different.