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1990 964 tight inner fan belt

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Vehicle Information: Year: 1990; Body Type: Targa; Total Mileage: 66000;

Installed a new inner fan belt today and find the belt to be extremely tight. Takes good preasure to push the belt 1/4". Tighter than the outer belt. More like rubber band tight.When taking it apart, thier were only 4 shims between the pulley halves which I put back between the pulley halves.The belt I purchased on line from a good source and was a AVX10 X 775.I started looking around and find some suppliers recommend a 9.5 X 776. 1. Would this size give me some slack? If so, what size would you recommend? 2. Should I get another shim? I have read that all shims are to go back on the shaft in front or in between the pulley halves since Porsche somehow uses these to position the pulley.Please advise.Thank you

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