Clutch engagement / slipping gear box, help

I have had a 2011 XP 850 Touring for about a week now. It was doing the hard engagement in reverse and a little bit in high. I’ve owned a dozen different Sportsmans but never had this issue. I figured it was due to the belt slipping so I got a new Highlifter 3GX and now it’s worse than ever. The quad is actually jerking in forward and still really hard in reverse. I know how to change belts, and I know it’s on right. It almost seems like the gear case is slipping and jumps in and out.
Advice anyone PLEASE. I love this machine and don’t want it to be a money pit. There less than 1,600 miles on it.

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