Do you make an adjustable cutter for different bar thicknesses?
There would be no adjustable cutter worth its salt. If there were, we would have invented it a long time ago.
You would end up having the exact same problem you are having now – constant problems tensioning wires.
The wires can only take so much loosening and tensioning.
To “Adjust” and move wires around for different bar thicknesses, that is what you would have to do….Loosen, Tension …. Loosen and tension – thus destroying the wire.