I agree with Terry, in that trying different types of infusion sets may help. Some have found that the steel sets work well, although I have not tried them.
I have been using the 90 degree Quick Sets from MM for probably the past 15 years, after using the angled sets for about 7 years. Most of the time I use my stomach, but occasionally use thighs or hips, particularly if I ended up with a bruise on my stomach.
You may also be able to get samples from your endo or CDE. They were helpful when I needed to try out different sets, and quicker than getting them mailed from Medtronics.