Be careful of old patches. They can really play havoc with accuracy. One reason I start with new cloth and cut from the muzzle. You want a stink, take an old lubed patch and put that in a sealed container and forget about it for a year. It turns black and don't open that lid. The stink will knock a buzzard off a ... well you know.

Those XTPs should shoot well with 85 grains of powder..