I have been having trouble with my washer machine drain overflowing after large loads . The grey washer machine hose drains into the 2” standpipe which sits about 1 1/2 ft higher than the washer. After a few overflows, I tried a new, taller standpipe and that did not help. Above the Sani-tee is the vent stack. Below the sani-tee and 60 elbows, it drains into the main cast. I have had no problems with backups or clogs. The new GE washing machine simply pumps too fast for the drain to catch up. what can I do besides replacing all of the 2” with 3”? Does this look like it’s done properly?