The short answer
is yes, you can shave some time off by adjusting your betting ramp with bankroll growth. You only mentioned adjusting upward as your bankroll grows. Will you be adjusting downward after losing sessions? If so, you could run up against limits, for instance if you are at a $10 table how do you adjust downwards. If you leave the minimum wager at $10 but adjust the max down to say $180, then you are changing the whole formula. If you aren't adjusting downward after losses, then you run into a RoR situation. 5% RoR may SEEM reasonably safe, but is pretty high.
Adjusting after EVERY session has other issues as well. It can play havoc on your psyche to have a severe losing session, adjust downward and try to win back using a smaller unit and spread. For this reason, most players adjust less frequently than you described. Maybe after a 20% increase of so for instance.
The final consideration is that the answer on paper (or through sims) is different than the answer in the practical world. In the practical world, your play will be going through several different levels as your bankroll grows from $20,000 to $100,000. Different rules, different crowded conditions at higher tables, and more scrutiny and heat as you make that climb which could reduce actual play time.