I beat Maat yesterday on my first try. The preparations took me 1.5-2 hours. The fight took 5 min 34 seconds...
I thought he was a real pushover. Used the def/vit strategy and it worked like a charm. Didn't use the sleep -> TP tactic. Just went in, ate defense food (steamed or boiled crab, the HQ one) SV paeon V+IV and drank pear au lait.
Somehow I managed to screw something up, because he finaled one of my peaons right from the start and I thought I was f*cked. XD
I had used the blink band and was real glad that I did, because after I elegied and requimed him I still had time to resing my lost peaon.
Bought a Vile Elixer +1, didn't need it.
Made an Icarus wing, didn't need it.
Used Hi-potion tank to get about 20 Hi-pots, used about 10 pots.
Maat always hit me for < 100 dmg. Exept when he used his TP attacks (dragon kick for about 150 dmg and one which name I can't recall atm for 350 dmg).
As an ELV I had close to 1100 HP, so I wasn't worried too much, but I hoped he didn't use Asuran Fists XD.
Only had time to use Spirits Within once and that was when he was already at about 40% HP... So I didn't use Icarus Wing and just wacked away at him and kept throwing Hi-pots.
Don't know about the EVA route, but def/vit worked great for me!
Good luck to all other BRD's!