sorry about the confusion last night - wendy's right - and you are right. it's fine to give one more shot of the old dose if a cat bounces really high and then take the reduction at the next cycle.
i'm not sure how long you will want to continue shooting through the bounce, though - look at how quickly he has cleared this bounce from last night's greens. Less than 24 hrs later he is almost back to the same level - i'm looking at last night's pmps of 92 to tonight's of 118. That's a pretty quick resolution from the 40's bounce. that would make me more cautious about the option of shooting through the bounce - although looking at an amps of 567 i can understand that anyone would think it would be smart to shoot through the bounce. i would too. but the speed with which he's resolving the bounce is something to keep in your mind.
One of the reasons you get seemingly conflicting advice is because cats do change the game on us. the cat that's just beginning to get regulated might take the full 72 hrs to resolve the bounce, but a cat on a pretty good dose and getting regulated, will at some point probably stop bouncing. so . . . we do the best we can and try to give all the info you might need to make decisions - because you're the person there having to decide.
i was making the comment about the volume of gravy based upon that rise from 75 to 145 in 15 minutes last night. if a teaspoon will pull them up, and that's usually plenty, then stick with a teaspoon. but yes, if he won't rise, then more gravy or karo is fine. punkin took longer than the suggested 15-20 minutes to show the rise from carbs in his BGs - more like 30 minutes. i started out giving him a tsp of gravy and retesting in 15 minutes, then thinking it wasn't working. i'd give him more cuz i thought he wasn't responding to the tsp. then he would end up really high with me thinking ohmygod_smile now i've over-carbed him! but what i learned was that he needed like 30 minutes, not more carbs. someone didn't point that out to me until i'd been doing it a while and i hadn't realized it on my own.
it sounds like you've got this all figured out, though. whatever works with Frank is what you should do!
eta - regarding the vet's comments - i think if you stay the course, Frank will decide whether or not he's going to go off. he's doing really well right now. just enjoy him!