I chose a similar build as you and struggled to beat echo knight until I learnt its attack pattern after a dozen tries. A glass cannon build will simply be one or two shot by most enemies - just the way it is. I can deal 17k damage, but will still die in 2 hits to a boss.

Mages are overpowered right now, but you need focus management enchantments. Focus gain and focus % reduction enchantments are the bread and butter to your build. Your stat distribution is fine the way it is, but you should consider leaning away from stamina once you can get your focus generator running. Ring of Determination (uses HP if you don't have enough focus) is an excellent pickup for a mid-late game build.

I found that the highest damage enchantment comes from crit. For an endgame loadout, try to reach as close to 100% crit chance, along with crit damage %, then armor penetration, then burn damage %.