For me, low carb is the best way to maintain the tight control. There is just too much variability eating a high carb load. I’d give myself a 1 in 10 chance of nailing the timing and amount of bolus with a high carb meal.
I’ve been on a very low carb stretch the last 11 days and my highest reading was 170, and that was because my pump malfunctioned. I keep an Excel log each day from my Dexcom of running 7 day averages and by giving myself a regular metric to watch it helps a lot with motivation. I have crude formula in there as well so I can see ballpark a1c, which helps me to see as it drops.