Trying MCH... I need help, please!

I'm lv 67 MCH atm, and almost have all abilities, so I've figured it would be neat to pack up and start to tighten up my rotations and so. The problem is that I couldn't find any precise guide, so I've thought of asking directly.

1) The combo sequence
I get that we - should - do 1>2>3, but what if 2 doesn't proc? Should I keep hitting 1 until it does? Should I advance on the combo only if the next is procc'd? (I realize reloads are good to ease this up)

2) Reloads
When not buffing for WF phases, should I use them on cooldown to guarantee successful complete combo sequences?

3)Food
What is the best one to have?

4) Overheat or not?
Well, I know there's a huge detailed thread about this here on the front page, but there's no TL:DR, how much dps gain is to overheat?

1. Compare the combo and non-combo potencies for Slug and Clean Shot. Using a shot without a proc isn't worth it. Just keep hitting 1 if you don't get a proc.

2. For Reload, yes. If Reload is used on cooldown, you get two reloads per Wildfire. Use Reload > 1 > 2 > 1 to get procs on both 2 and 3. Use Wildfire here if it's up. Then try to have Quick Reload available so you can use 3 > QR + 2 > 3 to guarantee two Clean Shots. If you you only need to delay Quick Reload a little to do this, then hold it. Otherwise its probably better to use it on cooldown too.

3. Direct Hit seems to be the best stat at the moment, but the others aren't far behind. To my knowledge, MCH does not gain damage from any stat significantly more than the others.

4. No idea. I don't think anyone has come up with a clear answer to this yet.

Ok answering this on a break from classes so I got to be quick about it. Also on a cell.

1) If there is no proc, then no just keep hitting one.
2) Yes, however if your timing gets off for some reason, and it won't be ready in time to use during Wildfire, then save it for Wildfire. The same thing goes for Quick Reload as well.
3) Sushi, unless your capped on d.hit (which you shouldn't be unless you do meld) then compeste.
4) From what I've gathered it's a 3% damage increase to Overheat, however you should only Overheat during Wildfire (otherwise it's a damage loss), and only if your heat is already at like 90 or 95 when Wildfire is ready to go. If your heat is below that then don't bother.