The pic you've posted shows the area of concern. I've recently set up my 2002 Mercury 50 after some major carb work. I have the manual which has pics with good labels. I realize it's a different brand and a newer motor but the concept should be the same.
The set up required aligning the various linkages in a certain order. I found mine to be significantly off. That was the set up from a FACTORY AUTHORIZED SERVICE CENTER after they replaced the power head years ago. The correct set up resulted in much better performance!
I suggest that you get a hold of a manual and follow the set up from scratch. Even if this isn't the big problem it's good to get this right.
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