Thanks, that's a lot of good information!
Unfortunately, I have limited time (and money) to execute any changes and I can't really develop the system to make it less user-friendly such that it would require speed monitoring. The Retroscan needs to be potato-friendly so most staff can be able to scan/digitize film without becoming experts. There isn't money to fund a full-time AV staff member who could seriously learn how to maximize the systems capabilities.
I'd definitely love to install a pressure plate to help with any vinegar syndrome, but I think that would be outside my skill set. However that does seem like the best low-cost upgrade after a new LED, so I'll make a note about that. Again unfortunately, anything with high vinegar syndrome is either going to have to be sent out for scanning/duplication by people with the proper equipment or more likely written off and disposed of. We have over a couple million feet of film amongst other AV mediums, and that generally means we have to pick and choose what we can save.
But again thanks, I'll definitely get this all documented so someone in future can hopefully try and follow your suggestions!