Emmy,
Thanks for the thoughtful comments. Actually I would prefer to do my own diluting as opposed to trusting it to someone else -- I have more skin in the game, so to speak. But it turns out that I may not even be able to do that -- it's not clear that a diluent is even available for my insulin (Novolog), but in any case, no one within 50 or 60 miles of here will admit to being able to obtain it anyway.
My syringes are calibrated in half unit markings (I made sure of that) and yes, I can inject half a unit. I thought it would be helpful to be able to use larger quantities to get greater precision, which diluting would have facilitated. But it looks like that dog just won't hunt. So be it. It is what it is and I will manage the process accordingly.
Actually, dinner is not (strictly speaking) my highest carb meal of the day. I follow Bernstein's pattern of 6-12-12, so lunch and dinner are essentially the same. My reading is highest at the end of the day (but not on a day when I fast) so it seems clear that my phase 1/phase 2 response is present but just too weak to keep up; thus, I fall progressively further behind as the day goes on. I've done enough experimenting and charting to be pretty certain of that. So very small doses will probably give me just the tiny extra push I need.
And yes, I intend to take it very slowly. I am keenly aware that insulin is a two edged sword and razor sharp on both edges. I'm keeping plenty of test strips (and glucose) handy, and I'm a compulsive record keeper.