I'm posting this in case anyone else has a similar problem and may find it helps.
Ok so its not the prettiest but it appears to work.
I am inbetween sizes with harness's so the seat harness I got ran out of adjustment with the leg straps and I couldn't get it tight enough to stop it giving me a wedgy..
I started out by taping with electrical tape a few strips of closecelled foam ( camping Karrimat type stuff) to the straps to bulk them out. It worked to a degree but it still wasn't enough plus the straps would want to sit at weird angles and I'd have to reseat them.
Then I thought of putting some foam cylindrical stuff over that..I was hoping to just push it on like you do when you want to pad bicycle handlebars but the buckles were too big to fit through so I cut it and taped it.
It works! Not perfect as I find if I really try and tighten it to maximum sometimes the clips come apart.I'm assuming that may be because the angle of attack is a bit different..? I think if I back off the tightness a bit it still works pretty well.
How tight are you supposed to have your leg straps in a seat harness?
























I suppose I could put on a few more kilos but I think I prefer this solution.... Actually when I bought it I was fatter than normal so the problem will only get worse as I lose weight! ( I'll still be too big for the next size down though..)