This info post shares some information, although generally meant for people who follow TR, it does offer some things to think about, but testing is key:
Is Tight Regulation Possible with a Full Time Job
On that note, I am probably sounding a bit like a broken record...sorry

, but I'd still like to see regular tests before you go to bed. Why? Well again, it helps to see what is happening at night, since at the moment, as I've mentioned before, you are only getting half the picture. The other thing I think might be useful is taking opportunities over the weekend to fill in some of the blanks like +1 and +2 - so you can get a feel for how carb sensitive Taz is, and to get a feel for when he typically onsets and how the insulin is working, when he reaches nadir, how much duration he typically gets. By getting more familiar with how Taz deals with insulin and carbs, when you ARE home and able to test, that can give you more confidence when you leave for work, and aren't able to test.
There were times where I had a lower preshot, and I decided based on what I knew about Maverick to leave some higher carb food for him in his autofeeder, just to be safe.
The other option, is to adjust your insulin shot times, even an hour earlier may allow you to get that out the door test - and if there isn't much of a food bump, you can choose to leave some higher carb food. Just a thought, not sure if that is possible.
There is nothing wrong with waiting to increase, so that you can monitor more closely. That said, SLGS would have you evaluate the dose every 7 days, and run a curve, and you've held for 28 days now, with a few curves in between.