Let me give you some examples:
On 9/3, he dropped from 354 to 150 in 5 hours...Not a horrible drop, but still a drop of 204 points (and we don't know if he dropped 150 points in the first hour and 54 points over the next 4 hours or anything else about how fast he dropped)....ALSO from the numbers he's had since you started, it looks like his body has gotten pretty "used to" living in the 300's and 400's, so dropping to 150, although not too low, is still unfamiliar territory for him....then as the insulin wore off, and he started to bounce, he had the PMPS of 2o1....then +5 of 318....then the 9/4 AMPS of 460....Once he started bouncing, he went straight up
Now we're at 9/4...AMPS 460 and he dropped all the way into green (93)...then started another bounce..again straight up to PMPS 201, then 373 @+5 and AMPS on 9/5 of 458
9/5 we're starting at 458....but he only dropped into yellow and just kind of stayed there....Flat yellows can be an "early warning" that something interesting is going to happen on the next cycle, but since you didn't get any tests last night after the PMPS of 275, we can't know...he MAY have gone much lower again or dropped fast again, which set him up to bounce again to 468 this morning
Just a theory but may explain the crazy numbers!
Vetsulin is a hard insulin to work with because of it's fast, hard drops and it's tendency to wear off early....the ProZinc or BCP PZI may work better, or even trying a totally different insulin like Lantus or Levemir might help