Specifically for the FasTrak, I've seen on this forum folks using various types of blades. Hi-lift, Medium-lift, Low-lift, and Gator. What are the differences for each of these blades? Are there any other blades? Also, what is best blade setup for my application...Northern, VA...Tall Fesue...cut to 3 1/2" length? Currently, the blades that came with FasTrak when new (2 weeks ago) and mulch kit baffles and block off plate installed yield noticeable grass clippings. I'd rather not use a bagging system. Thank you.