Back in July (which I know is Acient history but it’s the only comparison I have), I tried experimenting and did give 14% at PS and +1 followed by LC, at the time I didn’t see a difference in slowing down the drop. And then she began to reject LC after getting gravy. Picky cat

I love her but man her pickiness will be the death of me.
I’ll admit tho, my last food experiment was a bit chaotic and not thought out well so it might be worth trying again.
You’ve be doing this dance much longer than me but I’m not entirely convinced the high PSs are bounces. At least they don’t look like any other cat I’ve seen bounces. Christie mentioned possible loss of duration awhile back, which in my (novice) opinion is what I believe is happening. But I’ve been wrong many times before so I wouldn’t be surprised if I’m wrong about this too.
I’m rambling at this point but my other thought was this Lantus vial is alittle over 4 months old. It’s my first vial so I don’t know how to spot it but maybe it’s loss of potency?