You've been holding the 1.5u dose for too long and numbers seem to have gone up a bit rather than down. I think the last suggestion was to try a dose of 2u but it appears you only gave that dose once since and then dropped it to 1.5u. I understand being concerned when you can't monitor but with pre-shots in the pinks or reds, it appears 2u would be just fine. It would be helpful if you could get syringes with half unit marking to be able to do 0.25u dose adjustments.
Test during the day when you are able and if you can't test during the day, make it a habit to get at least one before test every night to get an idea of what Rocky is doing at night. Most kitties go lower at night than they do during the day. Also, if you are concerned about Rocky when leaving for work, you can always leave slightly higher carb food out for him to eat should he need it.