Renee
I'd like to summarize the approach to low numbers for you. If you get a number in the 30s like tonight, the goal is to get him up above 50 as quickly as possible. So you might want to give a tsp of HC GRAVY with a couple drops of karo, honey, or syrup. If you have no HC Gravy, then just put a few drops of karo/honey/syrup in a tsp of LC food.
It takes about 30 mins for food & karo to affect the BG. If he's in the 30s, You can test in 20 just to see if he heads up. If, next test, he's in the 40s, give him a tsp of HC gravy. There is no reason to give more karo if you have the HC gravy and he's coming up. If you don't have the HC gravy, give 1 tsp of LC with a drop of karo (again, if you don't have HC gravy). When he gets above 50, then try 1 tsp of LC food, test in 30. Once you get him up above 80, you can, generally, stop feeding and test in an hour.
Even if he's up around 100, don't get complacent until he's been without food/gravy for at least two hours and is still rising.
That is all a very general summary but we really tailor it to the cat and the caregiver as we go. If you got stuck alone, though, that should help you.
On the dose, I would go ahead and reduce him to 0.1u in the morning and see how he does. We don't mess around with 30s and the fact that he got into the 30s on only two shots, tells me we need to listen. You can always go back up if the reduction fails. I'll find a pic for you on what 0.1u looks like.
BTW, we don't wait for a dose to stabilize on a reduction.