If I may offer a suggestion... It looks like when you're shooting low, particularly during the AM cycle,Felix is dropping into the 40s by +2. You might want to consider testing at +1. Gabby was much the same, she would drop fast and early in the cycle. I would routinely get a +1. One other thought is to spread out Felix's food (e.g., feed him at AMPS, +1, +2 and maybe +3). This may help to keep his numbers bumped up.
Given Gabby's proclivity to drop like a rock, I would usually test every 30 min. Once Felix has earned a dose reduction, you can also be a bit heavy handed with the carbs. The goal is to get the numbers above 60 or so, that way you have a greater margin of safety should numbers start to drop again.