A simple non mechanical (adjusting downthrust angle with shims) fix would be a throttle to elevator mix in your transmitter.
Just add % down elevator vs increasing throttle position.
Its the opposite of a downline mix in a pattern plane (adding a few % of down elevator at low/idle throttle)
Personally I would start with adding downthrust and then add the mix if still needed...F3A guys always strive for "no mix" airplanes