the games are nice to have on a ssd and yours is not a small one but in reality is better to have a hard disk with the game you use less or the one you don't need to load faster, like overwatch, to start a match you need the machine to load faster the maps, so this one should be on the ssd
other games that doesn't make load map times a big deal, should go in the hard disk, on a dual hard disk system you eventually will find the hard disk, a decent one, not a slower model, good enough for most games
so keep the ones you want to load faster on the ssd and the others in the hard disk
about the steam games, i honestly don't open steam anymore so after i install a game i buy, i never open it