it would be really cool if the drawing board on Derek´s classroom training actually meant something you can use in the game, like how many jerks it takes to hurt Derek by one health with the current strength, but that would have to take a lot of math, and a lot of different combinations.
I also made a scale of what doors i think you should pick, assuming you're trying to beat the dungeon. It was made from my own experience. I call it: THE DEREK DOOR CHOICE SCALE (DDCS for short):
1. Shortcut door
2. Boring door
3. Wood door
4. Coco door
5. Gold door
6. Mystery door
7. Small present door
8. Medium present door
9. Large present door
10. Stardust door
the stardust door is the worst door to choose from when you're trying to beat a dungeon in my opinion because it has the largest jerk count than any of the other ones. although you might get lucky and have quite few, that might tilt over to the normal size of a large present door. Stats don't change efficiency. But I could be missing a major point that you are noticing.