I'ts not unusual to have difficulty with the backs of the lower legs closing. Use as wide a coverstrip as you need. Like I said, it doesn't matter what it looks like from within, but rather what it looks like from the outside. It is truly all about how well you make the armor fit YOUR body. Do a nice job with that, and you can be 300lbs and 5' tall and get approved. as for trimming the tops of the coverstrips, go for it. You have to be able to move, and this is perfectly acceptable.