I always tested again in 30 minutes, when my cat was in the 50s.
I was thinking that Belle needs a dose increase too, recently, but didn't say anything, sorry. I was thinking that since going from 0.25 to 0.50 was like doubling the dose, that since you have been at these teeny doses for so long, that you could maybe try a fat 0.25 or F.25 (just a tiny bit more than 0.25, or somewhere between 0.25 and 0.50), again, sorry, I didn't post this yesterday. If it were me, I would try that, since testing is a little limited, especially at night time.