That is one of the problems with Novolin is that it doesn't have a long enough duration and it is almost impossible to shoot low to stay low, because it hits hard and causes steep drops early on then wears off before the 12 hours is over. Now I am personally biased towards Levemir since that is the one that my boys have responded best to, but given a choice between Novolin and Lantus, I would chose Lantus every time. With either of the L-insulins (Lantus or Levemir) once you have a few weeks of testing data you can start lowering your No Shoot number until you get to the point that you know you are perfectly safe to shoot as low as the double digits. With my girl that was insulin dependent for 4 years I could shoot her when she was as low as 50 without batting an eye and go to bed and sleep like a baby because I knew she would not hypo on it. She was also on Levemir but my big guy sitting on my lap at the moment was a Lantus guy and this past November we just celebrated his 6th year OTJ.
Honestly if he was mine I would try to get him off Novolin sooner rather than later, as you will have a much better chance of getting him completely off insulin with a better, gentler and longer lasting insulin. Any of the 3 Lantus, Levemir or Prozinc would be a better choice than Novolin. Yes Novolin is dirt cheap upfront but when you start comparing how much more of it you use and the fact that it is one of the hardest insulin to get them off completely and into remission with the cost actually balances out. I would much rather pay for a better insulin that I have a chance to get my fur babies diet controlled on so that I don't have to pay for it for the rest of their lives than cut costs using a cheaper and less effective insulin. Just my two cents worth after having 6 sugarcats of my own.
Mel and The Fur Gang