So we all know ranger is basically dead, but you still need to beat him if you want to get that maat cap, which is something I'm working towards. After a few failed attempts at levels 66 and 68, I managed to succeed as a 69 RNG and just wanted to post my strategy if its of use to anyone. This was the only challenging maat fight out of any job on nasomi, and it's not even close (only one I failed, and failed 3 times before barely winning at 69), so hopefully this can help some other people. Most maat jobs you can easily handle him at level 66... ranger is not one of those jobs. I would recommend at least 68. I'm also assuming the fight is much more trivial if you want to get ranger all the way to 75 before trying it, but who wants to level ranger all the way to 75?
I used Musketeer gun +1 with silver bullets, since it is slow enough to gain 100% tp from one barrage after the first weaponskill. This wouldn't work with E. bow. The key to winning this fight I found was earth staff for the -20% physical damage. It's the only way I could survive his eagle eye shot, which still did 677 damage and dropped me to ~100hp. If you are a Taru... good luck. Hp is the biggest issue since you can drop him in a matter of seconds so long as you survive EES. I think you could sacrifice ranged accuracy gear for more +hp gear and hope to get lucky. Earth staff might be mandatory though because I think his EES would more or less one shot me (as a mithra) otherwise. Other gear is pretty standard ranger setup, with pot-au-feu of course. If you can find someone to make you a blink band to hopefully absorb his EES that would be a huge plus.
The strategy involves getting max tp outside of the arena using meditate, but sleep potions + opo-opo necklace should work too if you don't have samurai at level 30.
The key of course is that you need to keep him at that perfect ~8-10 yalm distance, or you will miss/do terrible damage. My strategy was: open the fight with sharpshot followed by /ra; as soon as the shot lands, use slug shot > shadowbind > barrage > /ra > slug shot > ees. If you manage to live, and you don't miss any shots, he will be dead.
You should be able to land that barrage shot, your ws and EES within a second or two, before he can move. If you allow him to move any closer, your ws/EES will likely miss or at the very least not do enough damage to kill him. If he managed to get one more attack in I would have likely died. If he got within melee range and used a ws I definitely would have died. So you can't afford any miss steps.
Good luck, especially to those taru out there!
also FYI: I tried to cheese him with sleep bolts on one of my failed attempts after he survived my attacks, but it seems he is able to get in attacks between getting hit by the bolts and getting the sleep affect applied, so that doesn't look like it would work unfortunately.