Hi Habib,
Rather than removing the manifold, I suggest you disconnect the header pipe from the catalytic converter and the transmission bracket if those things are connected.
The weight of the pipe will act to skew the mating surfaces, so give it some help as you slowly tighten the bolts in small increments. Wiggling the pipe as you tighten should give you a feel of what's going on.
I usually secure the manifold/ header connection anytime the manifold is off the car and then slide it in as an assembly, but in your case it's not necessary.
Doubling up the gasket is not a good idea.
Regards, Peter
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