Elemental is layered with Spell X, Greater Spell X, EVEN GREATEREST Spell X.
This is goofy.
http://wiki.guildwars.com/wiki/Glyph
Use the glyph system from Guild Wars instead. Glyphs are very simple in that game; you pick a spell you want modified, and before you cast it you cast a glyph to modify it. Want the spell to cast faster or recharge faster or do aoe damage instead of just the single target damage? Use a glyph.
Glyphs cost you mana and can also have additional negative effects, like making the spell take longer to recharge. BUT and this is the big thing, they remove the need for +1 spells that do the same thing as a prior version but with a different effect.
It's a much better system because it cuts down on needless spell duplication and lets players decide just how much they want an effect. Please please please put it in!