Amy,
Jill and Alex from the Lantus forum wondered about a sliding scale for Ruby. It's where you have a dose for each range of numbers, like .5 for 200-250 for example. Rob and Harley can make you one based on Ruby's previous numbers if you want.
I am undecided whether she does better settling into a dose or not. You haven't been able to do much settling with the curves she keeps throwing, so you basically have been dosing based on preshot but considering nadir.
I am glad you are sticking with ProZinc a while longer. The nice thing about this insulin is that it is adaptable. You can change around doses because you don't have to take a shed into consideration. And that seems to fit with Ruby's way of dealing with insulin. And you are close to regulation on a low dose if we could just get her to settle down.