You could try breaking your field editor into separate field editors. Put your notes field in a separate field editor. You could put that field editor into something like a panel set which allows you to set the height with scrolling. Then you would be able to define the visible height of your notes field and scroll down on just that field. I think that would work…

Have you considered using a row drawer?  Then use a Field Editor as Raymond suggests.

http://help.skuidify.com/m/supercharge-your-ui/l/269735-add-nested-rows-to-your-table-with-drawers

I believe that the field editors will repeat as “rows” if multiple records are returned by the query, so you could create recreate a “table” with field editors. That is what I was envisioning, but I like Irvin’s suggestion too.