Hmmm, would it harm them putting another 20 degrees on them?

Maybe if they are not lubed properly. The lube is there to allow them to take the angle tighten. What you are doing by angle tightening is applying a specific amount of stretch into the bolts.
 
Stuck now, do I risk it and leave it as it is or take it off again and fit another new gasket? Never had this problem messing with honda's lol.
 

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