I am at a loss, Lyndsey. It is a little inverse as there is a higher number in the middle of the cycle. But we have tried lower doses and he is never been in good numbers overall, not since the first weeks. you could try a higher dose - he is at a comparatively low amount, but I am afraid it won't help.
If he were mine, I think I would change insulin and see if Levemir or Lantus works. You can follow the relaxed forum with either insulin, where they start low and go slow and make dose changes slowly, as the bean's schedule permits for testing data. It is a small forum but they will be patient and understanding with your schedule. You could go over to the Relaxed Lantus forum and check it out. And send a pm to MommaofMuse (Mel). She is the one who responds most often. She has used Levemir and Lantus but I think posts on both forums. She might have some advice about which might be best.
He might be insulin resistent or ProZinc may just not be his insulin. You might go with Levemir in case he does require larger doses; it is said to sting less than Lantus.
I am incredibly sorry. I wish I was a better help or had the right answer for you. If you want to continue with ProZinc, we will keep plugging away, but I just have little confidence that less or more will help........