hmm, I knoe file recovery wouldn't bloat the file size to that extent, but try to turn off it off (or at least put it 2 1% of the archive). SFXs, Compression speeds (best, normal, store) can also bloat the file size. Use WinRAR
but perhaps upload a bunch of them part by part? or maybe there's other files in the folder. :/ 99mb is somewhat reasonable though since just one mp3 could be 10mb.
The mp3 quality could be lowered a bit to have a lower file size using something like dbpoweramp?
just use winrar, it compresses it decent enough and its free! most of the albums i download are archived then i just extract them into like 20 songs in a folder...duno what you are doing to fuck it up tho.