I ran a +4 on a bike with the same mods. Very easy to jump, and only pulled the front up when I needed it to. It was great in both the dunes and trails. I ran a +6 with the same bike, it was a little tight in the trails on turning, and would buck a little when jumping. But in the dunes it was just fine.
If you are on a budget, go with swingarm shop on ebay. If you want a round house, get a Stellar. The stock swinger is heavy and you can not mod all the ugly out off it.