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Hovis - can't recall, i suspect its 68 but I'll check and spacers are there
Do you need spacers on a 68mm shell? I think you don't. If you don't, and you have them in anyway, you'll be crushing the bearings when you tighten down the crank bolt. This will explain the crazy drag. And the horrible crunching noise. Although quite how it worked from the off I have no idea.
This could also explain why the crank bolt is losening off over time.
Get a new BB, remove the spacers, put some locite on the axle / crank arm interface (as it might be a bit sloppy after running loose), pop some blue loctite on the crank bolt, tighten to 35Nm, check the extractor bolt is at 12Nm, enjoy.
Howard
@lookitsluke
Great replies - you're all giving me hope.
upstart - cups went in really cleanly, so doubt (re: praying) it's not cross threaded
Pifko - if GXP drags, any thoughts on alternative BBs?
Santino - interesting thought, I have been known to run my chain a bit tight (although have been riding super slack since christmas in an attempt to stop the cranks from loosening off)
Hovis - can't recall, i suspect its 68 but I'll check and spacers are there
I'll clean up and disassemble tonight, come back with any pictures / or extra detail.
Thanks everyone