If u use just say fire, it's stronger percent vs magic resist right? So if fire gives u most trouble u can Lisa stack that?
Yes that is correct. I was thinking from the standpoint of: 3 Magic resist enchants plus either Lord Stone, Agent of Mara, or Alteration Magic Resist perks will be equal to the 85% magic resist cap for all 3 elements. Or 1 magic resist enchant plus all the above for 85% (unless you are Breton 0 magic resist enchants necessary). To replicate that you will need 6 elemental enchants, 2 Fire, 2 Frost, 2 Shock, unless you are Nord or Dark elf, 5 enchants - or if you have the Otar mask, you can get by with 3 element enchants and that.
So that's all I meant, from a means of optimizing, 3 magic resist enchants vs 6 element resist enchants for the same amount of magic resistance, means you have three other enchant slots open for other things.
If you make one Fire 50%, and one Frost 50%, you will have 50% resist for 2 elements using 2 enchants. You should probably do 2 Magic resist 25%(shield of solitude enchantment is stronger than regular magic resist enchantment), so you'll have 50% resist for all 3 elements with just 2 enchants.