Wouldn't a shorter or longer ics spring change the position of the floating piston in the chamber? This in turn would alter the purge of oil as you are riding correct? The problem is my tuner put 107mm long 1.6kg ics springs in my cartridges that originally had 90mm plus 15mm spacer springs that were 2.0kg. Im thinking the 2mm spring length increase causes the piston to have to travel 2mm farther up to the taper where they purge which with 8:1 rod ratio is 16mm farther of rod travel before my forks purge excess oil. Problem I'm having is the forks work great when the carts are purged by hand and the rod just barely returns to full extension. But after and hour of riding the carts add oil through the seal head and do eventually stabilize to where they start purging the oil as they should at the free piston, but the carts at this point extend with force and are harsh. Ideally when I pull the carts out after riding the rod should extend the same as when I purged them and assembled the forks. I do bottom the forks while riding but I don't think the rod goes far enough in the cartridge to purge oil until the piston is pushed up farther by added oil through the seal, at this point they purge and stay at this level but the rod has significant nose pressure and the plushness is gone.