Does fortify magick jut increase magic pool? Is there anyway to increase the regen rate of magic in combat?
No, the way to stay active for longer in battle is to lower spell cost.
Technically regen still works in combat, just drastically reduced to the point of being useless.
As for the original question: enchanting is a thing of moderation
Too much and you abuse the system and the game becomes boring.
...too little and you will barely get 2 spells off before running out of mana and having to run around in circles for 5-minute battles.