And of course as a spell-casting class, you need to look at the spells you can get. I levelled my Beastlord to 65 before starting on AAs seriously because the spells were so freaking useful. Right now I'm never lfg for long at all because of the 65% slow I got at level 65. So take a look at the spells that you can achieve before you decide to stop and do AAs, is my advice. From what I have seen, the only class that most people think NEEDS to stop and get AAs is the Ranger, for the EQ/AM3 AA abilities. And even then, last night I was grouped with a 65 Ranger who was a Baron, so it's obviously not "required".
But back to PoV tanking...when fully buffed, my Beastlord has about 5k hp and ~900 AC. My only defensive AA is Combat Agility 1 (2% melee avoidance), although I am working on getting that up to 3 (which will be 10% avoidance). Just the other night I tanked in PoV fairly well while our normal tank was running to PoK, and with a 61 druid healer too...really, getting those mobs slowed is key. And me having my 65% slow, and also being a high level, so I get fewer resists...makes a quite large difference. Heh, that's another benefit of levelling: fewer resist on your stuns, assuming they can be resisted (I have no idea, but would assume so).
But then again I was getting groups in PoV from 55 just because of my dps. So, I might not really be able to appreciate your predicament.
Game on,
The Oneiromancer