im looking for a list of all active JAV VR studios and if they are on SLR - its so confusing to me to figure out what releases are on SLR and which ones arent.

The active one on SLR are mostly :

https://www.sexlikereal.com/studios/sodcreate
https://www.sexlikereal.com/studios/kmpvr
https://www.sexlikereal.com/studios/natural-high
https://www.sexlikereal.com/studios/aqua
https://www.sexlikereal.com/studios/tmavr
https://www.sexlikereal.com/studios/max-a
https://www.sexlikereal.com/studios/koalavr

ChinChin VR are old movie, Casanova is not making new video too.
Some studio like P-BOX are still making video are exclusif to DMM...

Other notable studio for VR that are unfortunatly not on SLR are : Idea Pocket, S1, Madonna, E-Body, Alice Japan, Unfinished, MOODYZ , Kawaii, ...

    If it's not DMM and they are shooting, SLR probably has it. There are 50-75 or so movies I month I know for sure are sent over each month combined.