what size bottom bracket are you guys using?

[purple gerbil]

Mounting the XT FD-M750 took ages, see previous rant.......
The height is very critical, any lower and and it collides with the big chain ring, any higher and the chain rattles along the bottom of the FD cage. Probably about 1mm of correct height range. That is with 22 small ring and 44 big ring.

which probably means even once I get the right width (ordered a 118mm today), I'm going to have height issues with my 46T ring.   

think of this o.k
your crankset is moving further away from your b/b.
so your f/mech will have to adjust over to line up first ring.
will f/mech have enough pull to reach top ring.
f/mechs swing upwards in motion so the chain in little ring is gonna catch even more than it did before because adjustment swings it up???

[signalMTB]

installed the 118mm yesterday and all is good...shifts fine, only need a few small f/d adjustments as the chain is rubbing the inside cage just a bit on big ring.