What pressure are you keeping in the tires?
Too high. I run 25 in the RV-4.
My old RV-4 had tires like this, due to ginormously excessive toe-out. A friend drilled out the bolt holes in the gear legs and silver soldered in 4130 plugs. I filed the ends smooth, reassembled everything with a piece of angle and shims clamped to the axels to get just a touch of toe out and carefully redrilled the gear legs, being careful not to let the drill bit drift. The enlargement to final size was done with at least four drill bits, progressively larger by 1/64.” No more problems!
I’ve probably misremembered some of this, as it was 40 years ago or so…
Actually for taildragger RVs, the ideal set-up is "0°" without weight on the gear.
The design of the gear is such that as soon as you put weight on the gear, it toes out slightly.
Don't recall, but the toe out I had was very, very slight, done with brass shims. Maybe 0.050."
Here is the solution to camber adjustments. If you have one tire wearing evenly measured the camber angle while weight is on the wheels then measure the angle on the other wheel. Make the adjust by adding the camber shims. You can buy an angle cube from harbor freight. You have to measure using the rim, not the tire (it may be obvious but some people aren’t the sharpest tool in the shed like donkey on Shrek).
https://www.harborfreight.com/digital-angle-gauge-63615.html
https://store.vansaircraft.com/catalogsearch/result/?q=Camber