I mow with a 36" Lesco walk behind with a fixed deck. I mow a lot of Bermuda down here and scalping is a problem I have had and something I need to try to fix or make the problem not a worse. Mower came with blades installed with 3 thick washers installed on backside of blade. If I move these washers on bottom side of blade what adverse effects will this have. Better suction, less or nothing?