I've got salomon bindings and I have no problems with buttering... really though - all binding companies make 'good' bindings, some are better than others, but none of them actually suck.
the main problem I have with salomon is that they break easily... seams like something is always breaking. (from my experiences I personally like tyrolia bindings the best (the d9's were sweet for me).
as for nose buttering, you really gotta put your weight into it. I've use 176 mojo's with a center mount - they've got really soft nose's but I still gotta put a lot of effort into it to get a really good nose butter.