I've heard some ppl have had problems with PLD Maat. I was nervous going in, but was prepaired from doing my homework. This is the strat I used.
It does help to have some DD gear, but don't feel like you have to break the bank to go all out DD gear. I used a Life belt to get a little more acc for my ws's, and I think I switched out my back piece and that was about it.
I had gotten an xp scroll many months before I was ready for Maat, and one of my LS mates at the time suggested lvl'n during the fight. It worked out good for me.
1. I went in 350xp from lvl 70.
2. I went in nekkid and put all my gear on inside (pretty sure this does nothing, but who knows)
3. Equip'd Opo-necklace and slept Tp to 100.
4. Popped a Carbonara+1
5. Popped a Yag drink (I brought 3 to cover the full fight if I needed it)
6. Popped a Persikos Au Lait (to regen the Hp I gained from Carbonara)
7. Ran at Maat and engaged and flashed him
8. I waited for his flash to wear off, and used Vorpal Blade (I'm sure Swift would work fine)
9. Popped my Icarus Wing and WS again.
10. He hit me with a few WS's, but no Asuran fists. I was worried about his Invincible, but didn't even notice that he had used it early in the fight. I found this out after beating him, by checking my log.
11. I had some Hi-pots and Ether's just incase, but didn't use many.
12. By this time I was almost to 100Tp again, and he had me down to about 40% HP.
13. I popped my XP scroll and lvl'd to 70.
14. Hit my final WS and it was all over.
I can't remember exactly when I used my JA's, but you've been playing PLD for this many lvl's. The time to use them will come naturally to you as you progress in the fight.
Only other suggestions I have is to watch some PLD U-tube fights and do your research. Not all strats work for everyone. Walk thru the fight in your head a couple times before you go in, and last but not least, enjoy the fight ^^ Good Luck to you!