Darwin has been racing down that dosing scale.
With all those low numbers he's been getting it makes me wonder if he's a low rider?? some kitties throw numbers in the 40's when they are OTJ. Time will tell if Darwin is one of those.
I do think that you need to consider shooting some insulin. He earn't a reduction to 0.5u, and has been running low with no insulin, has anything changed recently?? removed dry food perhaps? any meds that he was on have been stopped? How is his General Health?
Just wondering if there may be some reason for the sudden change?
Though with some kitties, they do just flick a switch, for Darwin that seemed to happen on october 2 when you shot your first green.
With him running so low, without insulin (though I think the depot from the 1u and 0.75u is still in play here) you could perhaps drop the dose a little further shooting 0.25u or 0.1u.
In an ideal world we'd like to see him have a week of numbers in the normal range (50-80) before we take a reduction, but obviously Darwin has other plans.
Since it's only 4 days since he was on 1.5u, I do think that to safeguard a strong remission, you should be thinking along the lines of continuing with some insulin support, but the trick is to do this safely. You've take reductions as he has earned them and your data gathering has been very complete, so as long as there is nothing else going on, it doesn't look like you should have got yourself into a situation where Darwin has been taking too much insulin and been overdosed.
The way I see it the following are your options
1) shoot the reduced dose of 0.5u, as per the protocol (you may need to hold on to your hat, and for sure you do want to monitor closely and make sure you have supplies)
2) shoot a further reduced dose (you may still need to hold on to your hat, but it's also possible that this would prove a reduction too much and you may find yourself having to bring him up again)
3) No shot and see how he does(not my favorite option, he's had so many reductions so quickly that I fear you will not achieve a strong remission, and/or you might find yourself having to bring the dose back up higher than the 0.75u)
Darwin I like where you're SS is headed
Would it be unwise to NS this morning, and see what he is doing tonight when I am home and can check him through the night? I am also off tomorrow, so it would be better and safer timing for me to continue to monitor should he drop into the 30s.