More tension and more chain wrapped around the cog is good, in my experience. Don't know really about big / small.
After changing a brompton cog from (I think) 12 teeth down to 10, the tension needed to be increased before it was happy.
With a road bike with vertical dropouts, tensioner needed to be reversed from pushing down to pushing up before it was happy.
I hate tensioners. Track ends, horizontal dropouts, offset eno hub, are all better.
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