6'2" 170lbs, not as light as you guys but you get the point.
As for din, take yours in, i wouldn't want you to mess your knee up or anything.
when a shop mounts bindings, they have a chart that they follow according to your size, weight and skiing ability, they must follow this to avoid liability issues. so it'll be set low.
so talk to the tech and ask what they think about setting a higher din if your going into some rougher skiing
When I first mounted my Line Blends a couple seasons ago, i took them into my buddy at the shop to mount. I had a pair of Salomon STH16's, seeing as the din starts at 9, he wasn't liable to do anything, so, they we're cranked all the way down, below 9.
I have my din at 10.5/11, for my one lifes, but that's my big mountain ski. it works fine for charging cliffs and what not.
My green lifes will be set at 10 probablly for an all mountain ski.