Roger that. The green one I posted in the other thread is running 17" 9100s. They barely fit up in there. I'm sure you are pretty tight too.
My thought is to go 14" and consider offsetting them down an inch or so for added downtravel. This coupled with the axle being moved forward, which is always an incumbent modification. Let me know if you recall any thoughts from your build up, since it's been awhile.
Edit: actually, in this pic of yours it looks like you offset down too. Or at least it's not as tall in the engine bay like the green one. I'd be interested in the dimension from the top mounting eye to the bottom eye on the shock if you don't mind.