Here's my 99 FSR XC
I got the BETD too, and have always run it at 110mm. Makes a world of difference over the 90mm setting. At 90mm you are at 3.6 inches of travel. I think the bike handles much better at 110mm, not as twitchy in tight singletrack. I also put Mountainspeed's dropout bearing kit in, also made a huge difference in rear travel smoothness.
I have a 99 Fox Float RC and I weigh 175lbs. My pressure is 155lbs. I've never had a single problem with the shock holding air. I have friend's who run close to 200lbs in the same shock. Maybe yours needs new seals if it won't hold air. DIY job, $10 in parts from Fox.
I'm running a TALAS upfront, usually at 90 -100 mm for climbing and closer to 110 for descending. Love the performance of the fork, it is truly as smooth as my Vanilla Forx before it. Also been running X-9 shifters and X-0 r. Der. They have performed flawlessly for the four months I've had them, very positive feel for shifing, and I've not had to adjust them once. With my XTR setup it seemed like I was adjusting the cable tension at every ride.
later