Other Mac storage taking up 90GB! Help!
I woudn't be concerned too much with those two since they are only 33 gigs total. The 90 GB space should be of more concern. I suggest you get Daisy Disk or Grand Perspective to give you a color graphical mapping of your disk drive. These color maps make it easy to see what is hogging your disk drive. Daisey Disk, if obtained from developers site has a free trial.  Grand Perspective is free.
I'm not familar with omnidisksweeper.