Just wow.

The secret to landing any tail dragger, and this learned in a 1:1 Cessna 140, is at the moment of touch down, ease off the elevator. Let your elevator go from up to neutral or VERY VERY slightly down.

The bounce as stated above increases the angle of attack of the wing. Holding up elevator only makes this condition worse.

When the wheels touch the top of the grass, let the elevator go to neutral. I've only had ONE model that did not like this approach and that was a Top Flite ELDER; on THAT original kit the gear is WAY too far forward.

MTC YMMV