weirdest thing happened. i had doubles on to cut wet grass last week. today when we resumed the mowing schedule i took the doubles off, sharpened the gators, put them on and went. first stop, blade doesn't want to engage, finally does, but is turning slow. belts seem tight enough, but i tighten the crap out of them anyhow. a little better, i do the two properties, they look bad, the blades are tearing not cutting, blade speed still sounds weak. not good. i go back get the high lifts, put them on, blade speed sounds a little better with high lifts, but still weak, but it's cutting much cleaner than the gators. can i discharge with high lifts? will this cause lawn problems later on?