Horrible video skips with isboxer certain zones

I've just started running InnerSpace for the first time, set up was pretty easy, and all 6 characters launch and run great, video is smooth as silk on all toons when I'm running around out in the open. When I enter certain areas (bazaar, najena, places in pok), if I try to turn or steer my character, the video jerks hard one way or the other. FPS never drops, but I cannot even navigate through the basically gentle turns in najena. If I try to turn into a doorway for example, I end up turning around so hard I'm facing the other direction because of horrid video jerking. This happens even when I'm only running a single character in isboxer. If I run the same character with the same client ini file using the native eqgame outside of isboxer, every zone is smooth and buttery, and I can easily run thru any area without running in to walls.

The ISBoxer is fantastic for what I want to play with in EQ now, and it works pretty well in wide open zones. But once I get into certain areas, it becomes unplayable because of how the video lag and movement sensitivity seems to go crazy. Same characters in same zones have no issue when run from native eq client.

Is there something else I could be missing in the setup or in my innerspace profile?

I had found an older thread with someone having similar issues. I made a change to my cpu assignments from round robin to all cores and now the video stutter doesn't happen when launched with IsBoxer. Maybe this will help someone. This was going to be a show stopper if I couldn't go into any dungeons.