Thank you, Sienne,
I didn't know about glucose toxicity. I wish I'd heard of that earlier. I'll look that up.
Oh, I dropped his dose because we were going out of town for 10 days, and the sitter was giving him the insulin. I didn't want a hypo, and yet I didn't want his to have high numbers either. No one on the board felt he/she could advise me. So, I just dropped it to a dose that was clearly marked on the syringe. When we got back I raised it to 1.75 again. Then, I raised it to 2.0 a couple of days ago.
Yes, we nearly always test him at night before his shot. He's almost always above 400.