New to Return of Reckoning and information is scattered all over the place. I figured I might as well bite the bullet and ask here a handful of questions that have been bugging me to no end.
Quick background: Warhammer Online was a game that somehow passed me by, during a period that I did not have a decent enough computer (back in the day). When I heard of RoR, I was ecstatic. I really love the Warhammer universe and always hated the fact that I never got to play it live. This leaves me in an unfortunate situation - I know very very little about this game

1. Do Chosen Auras stack in any way with other Chosen auras of the same type? This question can be split into stacking beneficial aura effects and detrimental enemy effects. If you had 2 chosen in the same party, would they both benefit from 2 separate toughness auras? Would the enemy suffer the effects of 2 toughness drain effects? Are there exceptions to the rule? (Obvious ones being AP gain/drain aura, Magic retaliation aura, and heal debuff).
1a. If they do not stack, does this mean I should run as far away from other Chosen players? It would seem a huge waste potential otherwise. Would it just be ridiculously OP if they did stack?
1b. Also: if they do not stack, why do multiple buffs appear on the buff bar for the same aura?
2. Do any other buffs or debuffs stack - upgraded AoE Bane Shield comes to mind (multiple chosen again). Do Auras stack with other non-chosen class effects that offer the same type of buff or debuff? How about damage over time abilities like the early game DoT strike the Chosen gets (I forget the name)
3. I've read about caps on stats, can someone elaborate? Is there an actual stat cap? If so, is it a hard cap, or is this merely diminishing returns at work?
4. What does M1 - M4 mean? I'm guessing morale ability tier 1-4? I'm only 18 in the game so I have absolutely no idea how critical these abilities are later, much less which moral abilities I get end-game.
5. What can a Chosen do against a healer? 1v1 So far, my early Orvr/SC experience has been that I can simply out tank almost anyone, I have no ranged slows and get kited by archers (but they can't kill me), I can simply outlast any offensive caster. Healers on the other hand can literally sit there and kill me; I just dont have the damage to beat even the most basic healer. I don't particularly mind this per se, a game with rock paper scissors isn't necessary a bad thing, but I can't figure out if this is an early game issue, a class issue, or merely that I'm just bad in some way.
6. Do Chosen, or any other heavy tank class, get self heals later? So far, corrupted flesh has been glorious, but without potions, l there is no means of restoration that I've seen. Again, I have no idea what the future holds for me. I'm sure there are other amazing tactics to consider.
7. I may have missed it in game, but how many tactic slots do I get at 40? I'm sure I missed a wiki article about this somewhere.
I'll stop there because this is already becoming a wall of text. I would greatly appreciate any information people have on these questions. Feel free to to point me in the direction of articles I may have missed, although the reason I am here is that I prefer very detailed answers, if possible - something wiki articles sometimes lack

Thanks again!