We are laying a 100 sq. Ft. Patio using 2 – 2-1/2 in. PA bluestone irregulars. These guys are big and weigh a ton (well maybe 80 lbs. To 150 lbs.) We wanted to go big since we don’t want to deal with shifting and settling as much. Here’s my question: I am using a 4-1/2 in. Dewalt angle grin read more . . .