I got more travel out of my F120s by reducing the amount of float fluid in the air chamber.
Yes, but thats the nub of the issue – there’s only 5cc of float fluid in the air chamber, which isn’t enough to have any impact on travel – it barely coats the sides of the tube.
So, if there’s enough fluid in the air chamber to affect travel its because the lowers oil is migrating past the air piston into the air chamber and adding to the float fluid. Easy to check – float fluid is dark blue, float fluid plus lowers oil is blue/green colour – turn teh bike upside down and press the schraeder valve – see what colour the stuff that comes out is?
Sure, removing the excess fluid will get your travel back, but – it’ll just happen again until you fix the root cause of the problem, by removing the foam seal and replacing it with another scraper seal. Meanwhile the bushings in your lowers are also wearing out through lack of oil!