A minor and potentially not helpful suggestion, but a suggestion nontheless- have you tried out other LGSs? This also assumes there are other LGSs in your area but i sometimes find that when there's more than one LGS in an area, competitive players tend to
congregate together at one place and the other(s) get left alone. Failing that, you could advertise for a low-power or new-player EDH session with the store. They tend to want to get in new players and love selling pre-con commander decks that aren't moving so quickly compared to others. The suggestion above the suggested to talk to the store people is a good one- they definitely want your service so they might be able to find you less try-harder players to play with. You should always be able to have fun playing magic, EDH especially, and there'll always be somebody out there who'll want to throw together absolute garbage in the name of having a fun 2-hr game. Don't be disheartened because the competitive crowd don't want you- you don't need them either.