https://www.tirerack.com/tires/tests...y.jsp?ttid=226
No experience with the RS4, but several different sets of RE71R's for autox, I wouldn't want to put them on track, I think I'd be managing the heat of the tires more than having fun driving. For an HPDE give me a tire I can pound on all session and focus on my driving, that's what I'm there for, whether there's a timer going or not. I did 3x track days on Z2SS which the RS4 and Maxxis VR1 aimed to beat, I enjoyed that tire and would go for a similar tire again, longevity and tolerant to heat during a normal HPDE session.
imho an amateur will benefit more from a consistent tire that allows them to focus on driving well than a tire that has to managed and kept in a narrower window for peak performance. Yeah you might turn out a better lap on an RE71R or Rival S, but if you can't run the last session because the tire is dead or because you're dead from the effort of managing them, I'd call that a losing proposition.
HPDE and amateur motorsports come down to mindset more than equipment imo. I'm on MPSS now as a tire to put some DD miles on that will survive a surprise HPDE or two, idgaf about setting a good laptime so my next DD/ occasional HPDE tire will be a 300+ TW tire, either Firestone Indy's or Continental's.