I've run a Miche BB with no issues. I use grease on 75% of the threads and use Blue Locktite on the the remaining 25%. Comes out when I want to clean or treat the frame with Framesaver but stays put otherwise. The Miche BB is not too different in design than a Phil BB. The Phil BB comes with a blue threading solution and Phil recommends not using grease.

(Not saying the Miche is the same quality as Phil just similar in design.)

As far as spindle length I'd go with 110mm spindle with 75s.