Yes, it trails off as time goes on. I don't know why you're only getting 2 per round in the early rounds.
After around 20 rounds you will get an extra warning in your combat log saying that you no longer gain rage points either.
For very long battles, the best way to maintain high mana is the spell Mana Stream, which gives you back mana when a stack takes damage (including retaliation and poison effects).
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