I have an 18 GSA with the high suspension. I went with a Sargent heated front and Sargent non heated back. I had a Sargent on my K1600 GTL and loved it. I was told by them that their standard seat would be maybe 1/2 in lower than my stock seat on my high suspension. He told me the high suspension bikes have a thicker seat pad than the lowered bikes. I thought the lowered bikes were all done in the frame being lowered, but the seat must be a bit of that equation as well.
My seat now in the low setting is just right where I can flat foot the bike on both sides. I am 6 foot tall and longer in the legs. But in the high setting, I am on the balls of both feet. The problem is with my seat, in the low setting, it throws me forward into the tank. When its on the high setting the seat is flat and perfect but than I am to high.
Sargent said their seat will not throw me forward like the factory seat. My K1600 seat seamed the same way, until I put the Sargent on. The funny thing is I have been doing over 200 mile travels on the bike now with this seat that drives me nuts, and it really doesn't hurt so bad now lol When I first started it would get to me after 20 miles. I still hate being slid into the tank, but the padding I am getting used to.
I will update when I get the Sargent, and post some pictures.