I would increase the size of the nose wheel if you don't have any more adjustment in the nose wheel just be careful not to create to much positive incidence on the wing. If you are nosing over with the tail dragger when you are landing you may have to move the wheels forward. Also check the balance on the tail dragger it mat have the wheels in the right spot but you may be nose heavy. If you are balanced well and the wheels are in the right spot larger tires also help if it is nosing over because of tall grass.My $.02