From the mod descriptions you might be fine on jets, jets don't effect your bottom end unless your way off, do a plug check after you ride it, as long as it's still a brown to light brown/grey color your jets are fine. Any airbox mods done btw?, IE is there a top on the airbox, is it vented, or is it running a full external K&N now? Stock jet at sealevel recommended by FMF is a 260, 280-300 with the airbox top removed. I'm at 5280ft and run 300's however with dual K&N's, FMF SST pipes, D&D head, reeds, and boost bottle.
Keep in mind the banshee doesn't have real good bottom end. I would suggest putting V-Force reeds in it and a boost bottle (if you don't have them allready), seemed to help my wifes quad with bottom end.
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