QUOTE(blueostyler @ Dec 2 2009, 08:53)

What i don't know is if it's best to focus on gaining xp for now, and if it is, when to stop, because i'm being rapped on normal arena 8+.
It depends. I know for some time I was behind in the Arenas, and it was only recently that I managed to beat one at the minimum level (Apocalypse Soon at lvl 70). Gaining experience always gets you closer to more/new abilities, which, to my knowledge, you never really stop needing. At the very least, you can always use more HP and MP tanks. There may come a point where you want to focus less on experience gain and more on raising proficiency, and that just requires some dedication.
But for Arena purposes, I would suggest three areas that helped me:
1) END. Get this up, by a lot. Currently I keep mine 2 points above my level, at least.
2) Equipment. Get the best stuff that you can afford to without stat scaling pulverizing you, it makes a difference.
3) Item Slots. They are expensive, but worth the trouble. If you don't want to buy them, then the only other way to get them is leveling.
I should also mention Auras, finally getting two up to Rank 2 (which, again, you can only do through leveling) gave me a noticeable bump in power.