If I were you I'd wait til 68 and get your hands on a Harpe or Hoplites Harpe. This is how I fought him.
Gear:
Harpe/Spartan Hoplan/Bomb Core
Emperor Hairpin/PCC/Diabolos's Earring/Storm Loop
Scorpion Harness/Jaridah Bazubands/Toreador's Ring/Rajas Ring
Amememt +1/Swift Belt/Cobra Subligar/Marine M Boots
Meds and other gear:
10+ Hi Potions
4x Sleep Potions
Blink Band
Icarus Wing
Bream Sushi +1
Strat:
1. Go in and sleep to 100 TP
2. Get behind Maat then toss up Sneak Attack
3. Engage and do Dancing Edge, this should take a good amount of Maat's HP off
4. When Maat throws up Perfect Dodge, run back to the BC entrnace, wait for him to come back, then run back to the circle, by this time your Flee should nearly wear off, as well as Maat's 2H.
5. Standoff against Maat, he hits pretty hard so make sure you're ready to throw up your perfect dodge as soon as your HP is low.
6. Once you throw up perfect dodge, start using your potions and keep attacking him until your TP is 100+.
7. Once you're at 100 TP, use Dancing Edge, use your wing, then use Dancing Edge agian, this should hopefully make him surrender.
THF Maat is pretty simple, however don't take him lightly, he hit me like a fully loaded Semi at 68 and also fairly evasive. I used a Rabbit Pie my first time fighting, my accuracy wasn't so good and the defense didn't seem to help me much. So just go with Bream Sushi and you should be good.