Wow, that'a an issue...the hard points look fine for tail mounted servos, but not DEPS!

I think I would either install new hard points or build new elevators (but I'm looking at four months of snow!)

Do you think you could drill a 1/2" hole closer to the inboard corner? Forstner bits work well for this.
(When selecting dowels for the hard points, take a piece of drilled material to the hardware store to check the size...there's quite a variance)