To OP

You might try this on V4. It'll noticeably improve V4's skin. Its a python script... EZSkin 3. You want to use version 3 with Poser 11, not version 3.1 which is for Poser 12. There's options for regular Firefly IDL and Superfly material conversions...

https://cobrablade.net/snarlygribbly/poser.html

If you are having problems running EZSkin 3 in 11, download this patch for 11 by the same author, it's painless to install and it should sort any script problems you are encountering. The DL link is down the page a ways...

AVFix

https://www.poserlounge.nl/PLWP/