1. Mine our set in the 3rd hole down (3 inch setting, according to the manual) I now am mowing at 3.5 and have left the wheels where they are, is this acceptable? I noticed today there is a lot of scrapes/gouges in these wheels, and can't understand why? Is this normal? 2. Are the regular non Excalibur blades still being sold? 3. When installing the blades do you recommend putting them on in a certain pattern? IE: - - -, | - | Thanks.