Yes - drag launch an RST and it is toast. Stay away. I've also had Aluminum, lightened steel and the reg. Steel flywheel. The Reg. Steel worked best for me.
RXT all day long unless you baby - and I mean baby. Couldn't wait to get rid of that shitty slipping RST and upgrade to RXT. Maybe you'll get the RST and it's dialed in perfect and holds 525. Good luck with that.