All, I just bought a cforce 500 HO eps and I too desired better rear shock performance. After measuring the eye to eye length, I ordered replacement springs from Highlifter, for a 1998 TRX 300 4x4 as they use one rear shock. The Highlifter coils are rated to be able to support 100 additional pounds each. Right now, the cf500 is set on max load and rides terrible. I'll pull the rear shocks off, replace the coils and hopefully I'll start out on the lowest setting. With passenger, we never bottomed but the unit was very squatted and appeared that the rear tires were close to touching fenders. I'll repost after I'm done with results. Bike only has 155 miles on it, did oil change already. Going to adjust the tps also.....slow speed jerky-ness is very annoying.