You really need to read the tooltip of the relevant spells before posting; this is a forum where people are expected to understand the elementary mechanics of their class before posting. Also, when posting here, please leave out the whiny "sad mage" stuff.
Until 5.1 goes live, and we lose Pyro ticks in Combustion (makes me a sad mage), I am having an issue spreading combustion. I realize that I want to have Ignite and Pyro! ticking before I cast Combustion. That is not the issue. The issue arrises when I want to spread Combustion, since IB is on cooldown from upgrading HU. Is it worth firing off IB without HU to spread Combustion, and possibly missing out on Pyro! procs until the IB CD is up?
Edit: I just saw that Combustion resets the IB cooldown. Am I understanding that correctly?