Indicated airspeeds on the lower end are notoriously inaccurate for comparison purposes between planes. Especially with analog instruments. Differences in construction, static ports, tubing, etc.. can make quite a difference on the bottom (and top ends) of the speed indications. We've done a LOT of these RV instruments panels over the years (as well as a lot of Transponder/Pitot Static Checks) and I wouldn't be concerned with your numbers at all. I get to fly a lot of them, and regardless of the indicated stall, they all feel about the same relative to engine RPM and speed over the ground at touchdown. Everything is relative when speaking about indicated airspeeds. It's almost fruitless to compare 2 RV's without identical (and I mean absolutely identical) construction, static ports, pitot tubes, etc..
Anyway, in the end everyones RV's seem to stall at about the same "speed" regardless of what the individual airplanes indicators say. If you were up in the 70's or down in the 40's then I'd start to think you have some drastic error. At the point you are at, I wouldn't dink with it at all.
My 2 cents as usual.
Cheers,
Stein