I play a disc priest. I also play a paladin tank. I still sigh inwardly whenever a paladin asks me to please not bubble them.
I can not bubble you, sure. I have so much SP that my bubbles are officially Srs Bzns. I’m a raider, though, and bubbling is part of my routine. The muscle memory is there. Even if I don’t want to bubble you I probably will sometimes anyway, becuase god damn it, it’s a habit! Just ask Bingle, our other disc priest. Whenever we’re both in a raid we’re bubbling each other’s target(s) all the time, even though we don’t mean to, just because it’s how we’re used to doing things.
What’s the paladin tank to do? Deal with it.
It is easier to change your behavior than to change someone else’s.
Sure you can ask your healer to not bubble you. They may or may not happily go along with it. But why don’t you learn to adjust to the situation? When I’m on my paladin I’m typically taking off 1 or 2 pieces of gear. I might pull a little more as well. I’m usually still over defense cap, but I have some more mana to work with.
Treat it as an exercise. Alright, I don’t have much mana. What do I do?
How can I create the most threat with the least mana usage?
Can I take off three pieces of gear? How about wearing a holiday hat*?
Can I try a different seal? How about another Judgement?
Maybe it is easier to just ask the disc priest to not bubble you. “It gives mana when it pops” is all well and good, except for those of us rocking 4k+ SP. But trying to modify your own behavior is worth looking at, too.
*I’ve done it. No one said a word. :(