On Fatbikes, the tires have an outsized influence on the ride. Way, way more than any other kind of bike.
Not telling you to buy the JJ's now, but I've seen someone go from hating his fatbike to riding it exclusively after swapping the tires. Some of them are that bad.
See if your wheels let you run Jumbo Jims tubeless when you move over, that's an additional way to mitigate the drawbacks of a fatty. Tubes are heavy, and the rolling resistance with them is significant.