Sometimes it takes a few days to settle into a new dose. My Tuxie can take up to 5 days to settle in so that I can tell which way to go. He has done the same thing, where he went higher after an increase, then slowly settled down. Every cat is different, so this may be a case of waiting another day and continuing to test. I won't give any dosing advice, but it is also possible Frodo may need a higher dose shortly. Hopefully some of the more experienced posters will come by and offer some advice.
Good luck with the testing and numbers.