Why would you think 500 is an unusual number, Sheila? It looks to me like he had a more serious low today probably about +7 where the low was on the 24th. I'm going by his being at 113 at +5, which was lower than where he was at +5 on the 24th. I guess it's unusual because with all the rebounding we haven't seen it yet! Well, here it is.
Marci, you're in a serious rebound pattern with him, especially since a 500 has reared its ugly head.
You can lower the dose to.75U again and see if he does better, but he may need it cut to .5U before he comes out of the pattern. That much would probably reset the shed.
The other thing I'd like to add is it might be helpful to begin thinking of dose increases in smaller increments next time. When dosing around or less than 1U, changes should be made in less than .25U increments. .1U changes work miracles. Gandalf would bounce all over the place until I learned to make micro dose changes. I know that's the idea behind "fat" and "skinny" doses, but I still think there's too big of jump between even a fat .75U and 1U. Remember that it's a 25% increase between .75U and 1U! That's a lot. It's like going from 1.5U to 2U if you were on that high of dose if that comparison makes it easier to understand why I say it can be too much for some cats.
It's a little different when going down unless the cat is getting good BGs and earns a dose reduction. If you're going down to dump shed it's a good idea to drop a fairly large amount so that you're for sure under the optimum dose.
Look at it this way, you've tried a lot of different doses but none seems to be working for any length of time. Why is that? It could very well be the type of dose changes that have been made, ie. too large of ones. Does that make sense?
And I'm making my recommendation of dropping to .5U based on what he did on 6.27. You lowered the dose to .5U because he had a blue AMPS. The rest of his cycle was yellow, but it was a steady yellow. That's what we're looking for - stabilizing the cycles. So that day he got a 1U PM dose and he instantly dropped to green by +9, which is a good nadir hour on Lev. But think about it - his shed was emptied fairly well because of the .5U in the morning, but he was still able to drop to green the next cycle.
I'm sorry I didn't see that pattern previously. It's a pretty good indication that 1U is too much. Looks like the last time .5U was really tried was back in March, but it wasn't held for long.
Hope that helps. If anything sounds contradictory to something I've explained previously, please ask.