Chain will stretch (unless it's high dollar S.S. pre-stretched) over time or as it heats up. Swapping for a 1/2 link may work today but the best idea is to use a tensioner that you can adjust or a spring loaded tensioner (more expensive). If you have no place to hard mount then you could use a floating tensioner. Plenty to choose from in Mcmaster-Carr.
I'd call the manufacturer first though and see if they already have a solution.
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Meat, Inc. De Profundis
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