The wheels are almost on the CG, like yours. and this helps to avoid bouncing if you land on the mains. If the mains where farther back, they could induce a nastier pitch down movement at the touchdown and make things much worse.

Sometimes Roos and HS are prone to hop if their CG are forward and the elevons don´t have enough movement. The plane´s nose simply fall off at the landing because there is not enough elevon authority at low speed. It bounces hard pitching up the nose of the plane while it
still has airspeed to fly (hop)... at this point, you are just a spectator.

About crow in the Roo and HS unfortunately it can´t be done. it is needed all the elevon surface to control the plane at low speeds...

Enrique