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I had some additional thoughts on your cold start problem.
The fact that you have to try 5-6 times to get it to start when dead cold says your fuel/air mixture is to lean for cold start.
Engines need a richer mixture for cold starts then they do once warmed up.
I am wondering if there is a problem with your throttle body butterfly when dead cold.
you say once you bring the RPM up for a few seconds everything is fine.
so as a test the next time you try to start it after it has sat over night.
Press the gas pedal all the way to the floor then take your foot off of it and see if it starts normal. what I am trying to test by having you do this is to see if the butterfly position in the throttle body is linked to the problem.
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