When and should i be digivolving back and fourth for blue stats? Or maybe im under leveled?

So i just fought witchmon in the dream place. My team was lvl 34 all ultimates. Some with blue stats between like 50-300 (like savior huckmon has 300 atk but 50 for everything else). Im also in balance difficulty

Even then that fight was actually the hardest fight in a while. Made me wonder if im under level? Thought maybe to feed them some exp, but also wonder if i should revert them back to a lower level first for blue stats increase since not 100% how those work most have high % bond and 50-100 talent.