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It sounds like you're on the right track Andreas and I agree with Pete.
Your CCP being lower than spec will mean you're running overly rich on startup, and depending on your climate, your cold start valve may be firing when cranking creating an overly rich cold state which would make it difficult to start. You should try to get your WUR into spec for the CCP.
As for popping from unburnt fuel, it's possible that your air/fuel mixture for when the car is warmed up is set a little too rich and thus leaving extra unburnt fuel in the exhaust and causing the popping. You should first check for vacuum leaks to ensure you don't have any unmetered air in the CIS system but see if turning your air fuel mixture CCW (lean out) 1/8 or less of a turn at a time and monitor engine running behavior.
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