Thanks for reporting the camera behaviour. I have logged that on our internal bug tracker and we'll take a look at a that ahead of the next update to the Vulcan. in the mean time, disabling the "COCKPIT PILOTS" option on the EFB will remove the copilot from view.
The exhaust effect is not something I can replicate on my end, so I suspect it is a conflict with another product/mod. In order to confirm this, I would recommend renaming your Community folder to something like "Community.old", then creating a new Community folder named "Community" in the same location, and then installing the Vulcan into the new folder. Launch MSFS with only the Vulcan in your new Community folder and then see the effects are appearing as normal. If they are, that confirms there is a conflict with another mod in your ".old" Community folder.
Hope that helps.
Mark - Just Flight