I guess side-mount is out. Got about 13 inches clearance but the missus is rolling her eyes at the "Probably $850, needs an outlet in the corner, and may as well put recessed led's in the ceiling while I'm up there." I know when I'm pushing my luck...
Spring looks intact, had a new door and hardware installed about 4 years ago so maybe it's weakened. I'll call a door company and get the spring set properly first, not in the mood for getting my face peeled off by a pinch bar.
Maybe the door company will give me a good deal on a belt drive. From what I've read here belt drive Chamberlain sounds good.
Cheers mates, thanks again.