I am mowing with a 36" walk behind. I feel like I am not much faster than with a 21" push mower. What have ya'll found to be the most efficient patterns to mow? The yards I am mowing are around 6000 to 9000 SF with a house on them and light landscaping beds around the houses. Do you think it is best to square up and mow as big a block as you can with the walk behind and then get the rest and odd shapes with weed eater, etc.