I haven't heard about RV-8 strakes in years! Way back when, it was common for folks to put them on, but it seemed to be the consensus that the buffet on the tail (that was addressed by the strikes) only occurred to folks that had not yet installed gear leg upper fairings. Once those were installed, folks had no buffet, without the strakes. No one I know ever did a scientific determination of there being a downside to the strakes, but they essentially proved to be unnecessary if you had upper fairings installed.
Just my own experience - no strakes, no tail buffet in the stall, and have always flown with upper farinings.
Paul