I gave up on the bitmaintech branch because of some of the other changes they made to cgminer and pulled the latest ckolivas 3.9.0 repository, merged the bmsc driver and posted it to
https://github.com/fractalbc/cgminer.git This is very interesting.
Can you just clarify what you did when you "merged the bmsc driver"
The bitmain version of cgminer is terribly unstable and doesn't work with the adafruit piminer lcd scripts because of the API changes Bitmain have made so id be keen to replicate what you have done.
I cloned the official cgminer repository and added the bmsc driver to it without the other cruft from the bitmaintech branch. It might be worth testing your piminer with that branch to see if it works.
As a side note I tested a blue fury and it crashed after a couple of hours. This happened twice. I will test the blue fury by itself on a stock 3.9.0 build to figure out if it is something I did or not.