Did you not notice that you start with bashing the 212 MP/tick talking about potency and stuff...
... and then ended up with 212 per tick in your testing? Or am I understanding you wrong?

Situations where you use Energy Drain are rare and you usually don't plan all stacks for MP reg.

It's not apples and oranges.
If you don't want to join a discussion where some people are talking about the actual facts and numbers, don't join it!
Who are you to tell us what we should care about?