Question on my air fuel ratio on my supercharger wagon

Okay I took my car out today. Cruz in the car at 50 miles an hour the vacuum reads 13. So I'm assuming my power valve on 3.5 is okay? So now I am going to go down to jet sizes on the primary and see what happens
 
Yes the 3.5 power valve is good.
Yes on two main jet sizes down on the primaries to see if it leans out the 50 mph cruise air fuel ratio.
 
Ok. I down jeted the carb and now the reading is 11.9 to 12.5. so it's good. But now I have other problem. The blower belt keep coming off when I put a load on it. So I put on a bolt on tensioner. I think I need a spring load tensioner. But I don't know what kind to get. Hope you guys can help me with this. Here a pic of how it looks without the blower belt
 

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