I believe the books need some tweaks:
Needle & Thread books reward is stupid. BDU is easily found in game. It shouldnt be a reward. Vol 7 allowing to craft cargo pockets is much more rewarding.
Wasteland Treasures reward is underwhelming. Military fiber can be found, bought and scrapped into. The time it takes to get all 7 books (about 60 lvls worth of playthrough - unless you're lucky), military fiber is barely needed anymore. Mineral water book is a more fitting reward, as people dont care about water anymore, since mineral water and tea are so easy to make.
What's the point of one shoting wooden blocks with a shotgun, anyways? (shotgun messiah reward)
To me, these are the most troubling problems with the book rewards and I think it needs balancing/improving).
If we take scrap armor, iron armor and steel armor as tier 1, 2 and 3 heavy armor.
And padded, leather and military as Tier 1, 2 and 3 light armor.
I think it's a bit ♥♥♥♥ed up that a tier 2 set of heavy armor will provide more armor ratings than a tier 3 set of light armor. I understand the light x heavy armor thing and all, but I think that's bit much. Steel armor can rule them all, sure. But if you put in it in a scale, military armor becomes the 3rd best armor in the game, instead of the 2nd.
Bottom line: iron armor shouldnt have 5 more armor rating than military armor.
I also believe scrap metal turrets shouldnt be lootable. They make things too easy on lower levels. They should be attached to better barter 3's special loot and above. And should not be repairable unless you've spected into turrets syndrom.
Ideally, Intellect tree should hold its own using scrap turret and baton. Its the only2 weapons its got, why other tree-users get 3 weapons of choice + the possibility of having a little friend also covering their backs?