I’m not a big fan of ultra low carb, but do try to keep things as low as possible. Also, I have found the best way to avoid a large rollercoaster is to inject a good time ahead, split my dose of bolus which seems to catch the quick acting and the slower acting carbs. I ditched the spuds, rice and pasta for veg alternatives. This helped. It is not to say that I don’t deviate from time to time, but on those occasions I am prepared for a high rise hit. However, I never eat cakes and other desserts.
Having said all that, some days, for reasons known only to diabetes, I cannot seem to avoid high rises no matter what I have done or eaten. Those days I have learnt to not stress about, accept them and move on.