They don't shrink. You must be routing it differently. Whatever way you are trying to route it, do it the other way. My guess is that you are trying to route it so that the belt makes a regular S around the water pump and crank pulleys instead of a reverse S. The reverse S is the stock and shorter routing. The belt should go from the power steering pump to the bottom of the crank pulley and then around the water pump pulley down to the air pump pulley.
I can't believe you're hanging weights on it.
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