First of all, here is the link to the day before's post where Summer had those low numbers:
http://www.felinediabetes.com/FDMB/threads/help-summer-is-39.191487/ We call things a hypo, when there are hypo symptoms, otherwise it's just a low numbers event, which is anything below 50 on the human meter (not 60). Other than hunger or hanging around the kitchen, Neko never showed symptoms either. Good job handling those numbers though. Since there isn't a post today, I'll continue on this one, though we typically suggest starting a new post each day.
I am glad you did the 1 unit reduction as Karen suggested. Now you have to hold the dose long enough for the bounce to be over. Once the bounce is resolved, you can see if this dose is getting her into green numbers and if she is holding the reduction. It can take up to six cycles for a bounce to resolve, so that's how long I would hold to see what sort of numbers she is getting on the 12 unit dose. The larger 13 unit depot can also influence 4-6 cycles after a reduction.
As for how long you hold a dose that is giving green, TR suggests evaluating the dose every 6-10 cycles. I would always look at what sort of green I was getting and if I was happy with the nadirs. With experimentation, I found that for Neko, a good dose was one that was getting nadirs in the 70's. That would keep her mostly under renal threshold. As with all cats, and even more so with high dose cats, you have to learn what works for Summer. That "happy nadir" number might be different for her. And of course, be cautious that whatever underlying condition is causing Summer's need for more insulin can change. Whether it be Cushings or acromegaly, the underlying tumours can go up and down, changing the amount of insulin needed. But they can also be steady - I once held Neko's dose for 3 months cause it kept giving me good nadirs.