This is what I ended up doing to my 2017 DCT. I'm just a bit heavier than you at 255. At first I redid the forks with springs from Cogent. This was a vast improvement up front, but it only made the deficient spring in the rear more noticeable. I had the preload on the shock cranked up to max, but I still couldn't get the sag proper for my weight. I was going to change out the rear spring also, but I was able to purchase a low mileage Touratech shock. The Touratech shock transformed the bike. I'm able to set the sag to the proper height, the ride is superior and the bike can finally carry a heavy load. While I have no experience with just a spring change on the shock, I've read that many people have been satisfied with it. So, you should be prepared to do at least change the springs front and rear. Call the folks at Cogent Dynamics, they will be able to help you further.