I have seen videos of people demonstrating how to get unlimited magicka for destruction on youtube(however I can't seem to find them now), and the way they did this was to put Fortify Destruction(25%) on
each piece of their armor. And they also put fortify healing rate/fortify health on each one.
For me though, I'm only able to put those two enchantments on my daedric armor pieces, not the gauntlets, boots, or helmet.
I've also tried it with dragonscale, and dragon plate, however, I still get the same result. If this matters I play on the 360.
For anyone who has done this or has experimented with doing this, could you provide some insight as to why I'm not able to enchant all pieces?
Thanks

I've used 100% reduction on both, and the game was entirely trivialized, I had to revert to another save because it felt like I used /tgm.