If your flying off grass go with bigger wheels it'll make it easer to takeoff and land. The plane probably weighs around 2lbs right so it gonna bounce if it falls from the air in a full stall landing so try not to stall. If you want to do touch n gos keep your air speed above stall. What type of gear struts dose it have bent aluminum or music wire. You could try to beef it up whatever kind it is so they aren't like pogo sticks under your plane
. And for the wheels you could try hard rubber ones but watch your weight if your trying to keep it's wing loading down (check Tower Hobbies they have loads of wheels).
later Zach