I have theses binding and have not had that problem. However my lean adjuster did move on me once but that could have happened on my nasty wipeout I'm not sure tho. I love these bindings if it continues to happen contact Rome and they will make it right.
As for the stiffness it's all personal but I think they are a mid flex binding just like Rome says they are. I think you would be just fine. The biggest difference between these and customes is the aluminum heel cup. This will make the romes more responsive.
These bindings have so many adjustments. but like my 08 targas i cant seem to get the damn rubber band thingy figured out... any tips? there is no pics in the instruction manual
Also im a size 10 boot... Seems like the way they come stock my boots fit nice and centered