If by success you mean a consistent a1c below 7.5, we are not successful. Lol. Just as we are all physically different on the outside, we are different on the inside. In my opinion, there is no one route to "success". You know, YDMV. For us, consistently using a technique, e.g. pre-bolusing for meals, results in a reduction of a maximum a1c reduction of .5. However, adding another technique does not reduce the a1c by another .5. It just doesn't work that way for us. There seems to be a floor but no ceiling. In other words, diligence can reduce DD's a1c only so much, but slacking off definitely shows up quickly with an increased a1c (almost a 1.0 increase the one time we had a rocky time related to diabetes management issues). Since you're one this forum, I'm pretty sure you know the secrets to success. Diabetes is what it is. There's an a1c/diabetes management/life balance to be met, in my opinion. I may be in the minority here, but I value the life balance part a lot and don't do some things that may reduce DD's a1c. She's consistently around 7.5 with common sense, consistent management. No pre-bolusing, no CGM.