Depending on ypur elevation you might wanna try a 25 piolet have you messed with the air screw.did you try 2.5 turns out to see if it got better or worse. If it gets better 2.5turns out drop the piolet if it get better at a half turn out bump the piolet to a 30 but check to see if your needle clip is in the middlle. Needle clip should be in the middle.