I am looking at the FineCut consumables cut chart in the Powermax1250 manual right now..for 14 ga steel, here are the specs and consumable part numbers:
Retaining cap: 220854
Swirl ring: 220857
14 ga steel
Current (amperage): 45
Cut height: .060
Recommended Cut speed: 220 ipm
I have used this process on my machine a few times...and it works very well at the above settings...in fact I tried it right up to the maximum speed of 260 ipm wih no issues.....cut quality is better at 220 however.
My best guess is that you are cutting too high off the material. You say you are cutting at .08" (too high) and that will cause the torch to not fully penetrate the material. Reduce your cut height, and adjust your arc voltage so that the torch is truly at .06" throughout the cut.
Most of the materials I cut that are thicker than 18 ga.....I prefer to use the 45 amp shielded consumables. I get longer consumable life, acceptable cut quality, although the kerf is about .06" wider.
Jim Colt Hypertherm