Need 4-speed Help

It's a 3 arm style pressure plate. So, is the "Hung Clutch" describing the first problem I was having (Squeling and slipping) ? With the reinstall, it does feel different this time. As mentioned, can feel the clutch engaging much earlier and firmer...

I guess there's no easy way to check if the clutch disk is in backwards w/o pulling the trans again? As for oil on the disk, should know better, but if there is, any remedy for that other than pulling and degreasing?