Well Thunderforce IV is a MegaDrive game and therefore uses FM synthesis for the whole soundtrack. As opposed to SNES soundtrack which needed samples to be heavily compressed/altered from their original source to fit in the tiny cartridge space and the 64kb of audio ram of the SNES audio chip.
Thunderforce IV ost can't "sound better" because there is litteraly no compression or alteration of samples because there is no samples. The FM chip is generating the sound itself so no restoration is needed.
At the moment, you need to do this yourself (by using Mp3tag, Tag&Rename etc.). The audio files are not always consistently tagged when exported.
I recommend using the chart I created in the first post to match the original soundtrack list.