looks like you tried to put chain tensioner and gave up.
chain tension shouldn't be too tight that causes lots of friction when spinning the wheel with clutch engaged.
It should be just tight enough to keep the chain on the sprockets so the chain doesn't fall off the sprocket. which means it should be easy to rotate the wheels.
It is hard to use the chain tensioner since it rotates around the bicycle frame and makes the chain fall off all the time.
I have a spring activated chain tensioner if you want one. that would keep the chain tension work easy. or
here is a link you can buy one.
though if you can keep the chain tension good without the tensioner, then you don't need this.