Liz, if you have to constantly tweak your basals and carb ratios, you may benefit from adopting a "sugar surfing" approach.
This is my current approach to diabetes. Basically, I don't worry too much about getting dosages and basals right; instead I take a guess and then take more insulin or snack later depending on what my blood sugar is doing. A CGM is very helpful in this and can massively improve your quality of life; otherwise you need to test frequently.