We've never been able to get either as a 4th. We go when the crowd levels are typically 5-7 and we stack our FPs as early as we can in the morning (and try to move them up while we are there if we can to get them finished faster) in hopes of getting a 4th for RNRC (which has never happened). We have never been lucky enough to get TSM, TOT or RNRC as a 4th. Drives me nuts with the tiers because we have to FP+ TSM for DD and we all like it, but I love RNRC. We have never gotten a 4th FP+ that was even remotely useful at DHS even though it has always been no later than 11:15 (and usually earlier) when we have tried to get a 4th. We have even tried at that time and gotten told that there was no FP+ available for ANYTHING at that time (you can try again later because things might pop up). We go to DHS assuming that we will not get a 4th FP+ at all. I HATE it because in the old days we most often got only 2 FP for the entire day at DHS- TSM and RNRC (we love Star Tours, but rarely needed a FP for it). Now we can't do that anymore.