The limiter strap won't do anything for botoming out because of your weight. It is more for your ski pressure. The longer the strap the more your skis will lift on accelleration. Sounds like you will have to change your rear springs. I heard alot of guys putting the 440 race springs in to stiffen up the suspention. I would go to a dealer & see if they list a bigger spring 1st. I would change your springs 1st then play around with your limiter strap untill you find settup you like. 
