I think you can take him up to 5U. See if that gets rid of the blues and brings down nadirs.
Does he get a snack at +1 to reduce the diving at onset?
You want to try advancing the snack times and see if that helps. Feed a part of the +3 snack at +1 or even +2. And the +6 at +4. Will he be okay without the snack at +9? Feeding after the nadir can reduce duration and result in higher preshots.so he gets 1/2 can amps, 1/2 can +3, 1/2 can +6, 1/2 can +9, 1/2 can pmps, 1/2 can +3, and leave 1/2 for over night.
You want to try advancing the snack times and see if that helps. Feed a part of the +3 snack at +1 or even +2. And the +6 at +4. Will he be okay without the snack at +9? Feeding after the nadir can reduce duration and result in higher preshots.