Hi,
I am new to type 1 - my 9yo daughter was dx four months ago. I am type2 and have been reading Bernstein for a few years. I just switched my daughter from Humulog to HumulinR because I felt like the Humulog was too powerful for the low-carb diet. She was crashing and complaining of hunger soon after eating with barely any insulin. We've been on the Humulin for three days now, and what a difference! She loves it, and is bouncing around the house saying "I'm not always hungry!"
Sorry I can't help about the square-wave...we do MDI. Good luck!