At Omega I had the lv1 spells (fire/blizzard/thunder) juctioned to hp and str and some other stats and had them maxed since your main priority during the game if youre going for maxed stats is to get the stat 'bonus' junctions from the gfs so you can put those on as early of a lv as possible.
As to the topic, junctioning death to my status def was the only way I could possibly last the first turn vs omega since all my team was 100 =/