1) When is the best time to repair units?
I saw that the reinforce cost wildly varies.
Is there a specific remaining units count that gives you the best bang for the buck?
For example, do you repair a unit when it's down to 9 strength or do you wait for more casualties?
I find that having weakened units really push the enemy in attacking it, often making your line collapse...on the other hand I would like to save as much resources as I can.
2) Repairing when next to the enemy
I see that you get much less reinforcements when near enemies, like 2 points per reinforce. Does this also cause a cost penalty?
3) Does the presence of a transport affect reinforce cost? I know it does in panzer corps.
This makes me really wary of taking them on some units that are favorite targets by enemy planes: AT guns and light AA guns: except they have 2 hex movement and really need them. Being constantly bombed means I have to reinforce them very often.
4) AA covering fire for optimum troop preservation seems a bit wonky: I witnessed an enemy plane attacking a battleship covered by an AA gun, a destroyer and 3 fighter planes and I swear it took 1 casualty.
This really makes me wonder what's the most economical way to deal with enemy planes.
5) Same question for fleet battles: while ground combat is so nuanced, ship battles end up being massive slugfests. Besides maintaining optimal firing distance while dancing ships around, is there any other trick?
6) Captured/Rare equipment.
I got a Japanese light tank and I noticed it has that slow repair trait. Beside recovering 1 strength per reinforce, does this incur in a "higher than usual" cost repair compared my own USA light tanks?
7) Finishing a scenario earlier than the turn limit...does this cause a loss of requisition (or maybe a bonus?)

Thank you for your support, as usual.