The biggest trouble that the XP suffers from when riders 250# and above ride the XP is the overall stock rear suspension, It doesn't really matter where your limiters are set at if the center & rear shocks sage so bad that the running boards create drag and handeling issues.,,,,,,You ever notice how low the rear of the XP sits in the snow ? That because the rear shock are saged and only rated for 225# riders which are whorthless for heavy riders. The dual action center shock springs are also rated for 225# riders which require that both springs be changed at a minimum to accomadate the corrcet rider weight....2 Fox Zero Pro's is a real good answer to the problem
The 2 stock rear torsion spring are also very soft for big riders as well. You can either purchase heavier torsion springs or for real cheap $$ have your local machine shop cut 2 new blocks that are a 1/4 inch larger on the "#5 adjustment side only" over stock. The 1/4" over size on the #5 side allows the spring to be cranked up stiffer which will allow those torsion springs to work better for heavy riders.
When your limiters are tight your front end and ski pressure become heavy. When your limiters are loose your front end and ski pressure are light and nimmble. Again rider weight should be factored into the adjustment.
When you climbing have your straps out allows for the least amount of front end drag. When im climbing i prefer my ski's to barely touching the snow if at all.
OT
