When I read your post, I just read that you were a pumper and assumed that you were talking about pump sites. That's what I described. I didnt notice that you were talking aboit Dex sites.
My Dex sites are a bit different. I use the center of my abs from just below the ribcage to just below the navel, and can get quite a few insertion sites that way. I reserve the outer parts for my pod.
I do not use my arms for my Dex but i do use my outer thighs. I get a ton of insertion sites on those areas too.
I have fewer sites for the pod because I make sure each insertion site is at least an inch away from the last. The Dex is so small and the wire so thin that I don't particularly worry about how close the sensor I'm inserting is to the last one that was inserted in the same area. I've left a sensor in for as long as 3 weeks, generally no fewer than the 7 days given, so by the time I've rotated back to the same spot, I can pretty much assume the the site has adequately healed over.