If you are running out of mana you are doing something wrong. Firstly you are getting mana back from
JoW,
JoW is being refreshed automatically already since your hitting the mob. You Get mana back WHEN YOU HIT the mob end of story. The amount of mana back is actually nearly enough to maintain threat. If you are burning a lot of mana use
Seal of Blood (Assuming you are horde). Since Seal of blood hurts you as well YOU WILL GET HEALED WHICH GIVES YOU MANA FROM
SPIRITUAL ATTUNEMENT. If you are alliance
SoV generate loads of agro for very little mana anyways.
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Okay as sadistic as it sounds , it might work.
Never thought of hurting myself just to get a heal so i can some mana out of it

Any way that i can get my reckoning proc activated as OT?
However i am sure that the judgement of wisdom gives you mana when mob hits you, and the seal gives mana when you hit the mob.
I used to be a paldin tank fo a long time and unless it has changed , i have seen this from my own eyes.