I didn't see any difference, but I haven't done any stints longer than 10 laps or so. This was in the FBM, so I can't compare that to pre X30, but it didn't feel like the R1s were that much hotter than before.
And Scawen's recent post confirmed it anyway. R1s and R2s (and R3s?) are the only ones affected, and for the best. I always thought the R3 and R4s were too neglected, which didn't reflect real tire choices in racing series.