the only time they are uncomfortable are when I am excited and I crank them down to hard. there are two kinds of back bands in LL.
Old style which has webbing at the end of the ratcheting straps going to the Back Band
New Style - which has a rigid plastic band going all the way around.
Old style there is an adjustment at the back of the cockpit that keeps the back band from falling down. make sure that you let that out enough so when you tighten the back band in doesn't fold in.
New style is rigid and does not have this adjustment.
If backing off on the tension and paying attention to the the folding caused by this back strap doesn't work. You can Call them up and get a retro fit to the new style back band. Make sure and get the guide hooks for it. I think if you send in your old one it was under $50 for the new. But I am not sure.
friend of the fork, knife, and spoon