Sent you a direct message about grooving these tires... ThanksThe 360's or the 340's? I ran the System 3 ds340's which are the traditional paddle last weekend on my XX and I was more than impressed for the money. I have the 31-13x15's on Packard's ultralight wheels and I comp cut them and got them to right about 32lbs-ish pounds for the combo.....which is very light. They are a big tire with a lot of paddle and if you where in larger dunes I would probably stagger cut them, but for where I ride they work great! I have the Speedwerx 3r and was only running 8900ish RPM with the weights set the way they came in the kit but didnt wanna mess with clutching as I was only there for a "day trip", so pulling a little weight to get the RPM up would work even better! Guys behind me did comment on how much sand they throw, kinda like how Skats do. I felt that if I wanted to slide the car and feel "loose" then you could run in 2wd and throw it around but if you wanted to feel more planted then 4wd worked great for that!
I have not ran any other paddle on the XX but have had STU's, Skats, Sand Slingers and probably some others on my YXZ and RZR and for $400 shipped to my door for the 2 rears, I am not sure you can beat the performance for the money!
Here is the is SS360