Looking for some advise re the fork on my Levo Comp. The shop set my sag. I took a first short ride and thought I would check it.....lots of mid stroke support but also firm overall. I checked the air pressure....virtually nothing! I gave the fork some good cycling with rebound fuuly off...rechecked...same. I expelled all the air through the valve and the sag is the same...barely 20%. Anything I can do or is it faulty?