+20 - Full Unyielding Int gear
+8 - Egghead Mutation
+3 - Flanel Jacket and Jeans with the casual lining
+5% Well Rested
- Food items like Canned Meat Stew, Glowing Fungus Soup, Cranberry Relish (5% buff each, they do not stack, Cranberry Relish = 10% buff, it is the best one) (Herbivore Doubles Effects of Cranberry Relish!!)
- Bobblehead (Leader bobblehead = 5% Buff, INT bobblehead +2 INT, Curator perk under luck can double the effect length, bobbleheads don’t stack)
+5-10% - Wise Mothman event
+3 - UNY Captains Hat
100% - 4 Lunchboxes
+4 - Building Team or +1 if your alone

PERKS:
+3 - Night person Max LVL
+15% - Inspirational buff stacks, stack when sharing 1, 2, and 3
- Strange In Numbers for Mutations

Armor Glitch:
Die, by some means. Do not respawn but rather quit to the main menu from the death screen. When you come back into the world the effects will be doubled on your armor.

Here is the exp scale as you reach higher and higher levels
https://www.desmos.com/calculator/ppqw4oddri

Good luck out there