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275* probably won't get you crispy wings w/o burning them. You'll need to get up over 300*. Check the specs. on your smoker - it may not be rated/capable of reaching higher temps. Some of the guys with gas have a few tricks up their sleeves to get their temps higher. Hopefully one will chime in.
Sorry I didn't notice this was already in the propane smokers section.
My MB gasser hit high temps well, it could practically grill. It was the lower temps that I never could get. Maybe the regulator needs to be reset? Check for bugs, kinks, debris etc too.