How do you get the stats up so high? For both Flynn and your demons? Even with the + Apps I doubt mine would reach that high.
For Flynn I had extensive emphasis on magic and agility on my initial play through (it was about 300 Ma and 120 Ag when I hit level 99) and Incensed the most of the other stat points.(I'm currently at the end of my 3rd playthrough.)
For the demons I used save scumming in conjunction with the app DLC and all of the stat enhancement apps. If the demon didn't get the stats I wanted I reset the game to just before it leveled up. It's a... somewhat tedious process even with the EXP DLC due to the fact that the game frequently seems hellbent on not giving you the stat boosts you're looking for. Aeshma starts at level 10, hence why I was able to get such an astronomical magic score off of him and the stat apps let me get great stats across the board with no special investment..