The differences are:
1) I use a 45ml Paterson Graduate instead of the 100ml one; and
2) I bought a new travel bottle with a similar dropper style cap, so I didn't have to be as concerned about the efficacy of my rinsing regime.
And I base my calculations of volume on 6 ml concentrate per roll of film. That number comes from a straight extrapolation of Kodak's capacity recommendations for HC-110, so it most likely contains a healthy margin for safety.
Of course, when you use HC-110 in a replenishment regime, there is no down side to increasing the amount of developer you use each time, as all but a small fraction of that developer just goes back into the bottle afterwards.