Has anyone tried or seen someone use a bb-7700 bottom bracket with an octalink LX crankset? If it would work I could get the q-factor almost 4mm narrower.
Nope, will not work
Road and XTR Octalink is the V1 spline pattern, All mountain (except XTR) used V2 pattern which has much deeper splines.
Besides, you need to maintain the correct chainline.
Rollin With No Colon!
The Bike Whisperer
Crohn's and Colitis Foundation of America