I could do that but it won't have any impact on compression travel on my setup as the springs are linear and I'll be maxing out the height. I don't have any issues with the perches rubbing the tires either as you did.
Yep, I had the same issues with the Tanabe's. Had to fully compress the helpers and had to change from 5k to 6k springs to keep off the bump stops on big bumps. I never measured the available compression travel on them though so that's why I'm asking the question beforehand for the AST's. I won't have that number for the Tanabe's until I remove them. I just have a full droop and a normal ride height measurement from the bottom of the top mount to the top of the spring perch. With 6k springs, it's a 2.5" difference.
So, you think the 1.5" of available compression travel before hitting the bump stop is enough or should I order a set of 6k springs to get another .5"? Unfortunately, I can't re-use the one's off the Tanabe's as the diameter is different.