It doesn’t matter if it only supports 24p by applying 2:3 pulldown because if it accepts it, it can be vulnerable to the frame repeat issue. If you are confident that TMT5 is not outputting at 24Hz rate, you should use 59Hz and not 60Hz. You probably won’t be able to perceive frame repeats at 60Hz since the difference is small, but they are there and it is not correct for video sources.
Pull up the Windows resource monitor and look for anything suspicious while watching.
