Yes, but instead of cutting grooves, I sanded down the underside of the saddle, like I would when setting up any acoustic instrument - and properly set the nut slots as well... The only time I would make grooves in an acoustic instrument's saddle would be if it didn't match up well with the fretboard's radius, or I wanted to do something with string spacing...IME, most acoustic electric instruments can benefit from truing up the saddle's contact point with the pickup, and making sure everything's good to go there...
Edited to add: this is typically a bit time consuming to get right, and takes some caution and meticulous work...
Thanks for the info. I can tell that this thing needs some care, but I wasn't quite sure the best way to approach it. I also found a Fishman acoustic pickup at a yard sale, so someday, I might have a decent Playmate to experiment with.