2″ spring spacer question

Installed a 2" billet aluminum spacers I got off ebay today, Can Am Bombardier Outlander 2" Lift Kit 650 800 Fits All Can Am ATV's LK 00 | eBay.During the install I I set the shock preload at the half way mark, I have been riding it with the preload set as high as it would go, well once I was done with the install I could tell that the suspension was way soft. Rode it around some and kept adjusting the preload until I maxed it out once again but when braking the front still dives more then it did before the spacers. I thought the theory behind the spacers was to stiffen the ride, from what I have read about other installs it seems like they run with the preload at its lowest setting once spacer are used.

In case any one cares, I rented a spring compressor from the auto parts store which worked but was a real pain in the rear. The tool is too big for the ATV springs and would drag on the shock body so bad that once the spring was compressed enough to remove the cap I had to release the spring tension to free up the shock and slide it out of the spring then put the shock back inside the spring and retention it. Scrapped a few patches of paint off my shocks during the process.

For $20 the spacers seem to be a good deal, saved me from having to cut pipe or fittings to make them. The spacers did raise my rear height 2 inches and the front about 11/2 inch. ATV is noticabley higher when I get on it and my small 26" tires still have plenty of room.

I was hopping the spacers would stiffen the suspension and keep the ATV from squatting so bad when riding 2 up, I’m not a small guy about 320 lbs so when I add another rider I’m pushing 500 pounds of rider weight.