How to generate more hate than a healer?

[Jahaudant]

If you're dual tanking and your support tank is hurting, provoke and cover!

Provoke places you at the top of the hate list, covering after that would be pretty pointless.

If flash is resisted I guarantee it's less enmity.

I highly doubt this is the case, it makes no sense and wasn't the case in XI either. I will test it tonight though, unless you aren't just guessing and actually have evidence?

That GCD of a resisted flash is better used on a shield swipe or RoH.
Generating more hate than a healer is not the question
Also, it could be your shield.

OP is describing problems in keeping hate on multiple mobs at the same time... none of this advise makes sense.