You have the air filter, that's good! Now how about removing the airbox lid to let it breath? More air + bigger jets for the bigger pipes = More Power. These mods welcome future motor/cylinder work. Sounds like the best paddle for you would be the Sandstars, they'll grip all around. I'd suggest a 10 paddle for a stroked Shee only. And though I luv my T5's I'd say go for the FMF Fatties who are to have same performance + they're silencers come with spark arrestors. T5's require bolt on sparky's that cost over $150. I have an FMF Fatty on the my kid's Blaster, it's badass!! Order the Outerwear for the filter from any vendor, everyone has them!
Ride the shit out of it and be safe. Don't shift that next gear if you don't feel comfortable. Don't worry bout competition just practice riding skills. You'll be ready for more upgrades once you get that down. When new top end is due you can get port & head work, aftermarket reeds, cluth & shifting mods!
Wikipedia's Banshee definition is the best sand bike ever!