I'm a big fan of thigh sites. I get as close on either side to where my jeans seam runs without getting under it, about 1/2-3/4 up. Never had a lump, maybe it was a fluke? I also get really good readings from thigh sites, as well as side of chest sites.
I just started the 3rd week on my current site. It ain't pretty to look at but it's still well stuck with the flexifix. Hope it works better for you if you try it again!
I use my upper arm. The most accurate readings.
I tried my thigh once. But pulled the sensor out the first time I pulled my pants down.
So, I never tried it again.
So, I rotate, left abdomen, right abdomen, right arm, left arm.
By the time I get back to the left abdomen, it is a couple of months passed the last time.