Thanks, Jenny. Some good ideas there. I couldn't find a spring that would fit as the axle is quite short, but the O-ring does provide some compliance. I already had quite a bit of toe-in, enough that the tires are worn quite conical. The plane in question is an older WM chippie with a smoke muffler (and thus a lot of lead in the tail) that the original builder installed. It also has retracts so the wheels are back from where one would like them. On a good day with a bit of a head wind and full flap, I can set it down at the start of the runway and stop before the end. The brakes just improve my success rate!

Since I don't use smoke, I plan to replace the smoke muffler with a stock one (Saito 100), remove the lead from the tail, and rebalance by moving the battery. It's a fun plane to fly but making a good landing is a challenge.