I have a Woods 44" ztr mower that is side discharging, not bagging. The blades are super old and look dull as anything. I want to get new ones. Looking thru the JThomas catalogue, I have choices of: Offset, Hi-Lift, Contour Shape, Mulching, or Hi-Lift Mulching. (I'm looking under Grasshopper as I know they are inter-changeable with the Woods) What's my best choice for blades for spring growth on this mower, and are there blades I should switch to during the heat of the summer? I'm THINKING of picking up the pair of Hi-lift mulching blades for now, and regular Hi-lifts for the summer. Is that correct or do I have it backwards? Thanks!