Radiator hose clamps

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I changed all my hoses and ordered the era specific old style clamps from Snyders.
The clamp has a screw and square nut to tighten.

Has anyone had any trouble getting these clamps to tighten before reaching a point of stripping them?

I have two clamps that are close to becoming over tightened and still have a small leak.

The clamps are on straight and not on an angle. Hose pipe connections are clean and smooth. I just think the clamp is not doing the job.

Should I toss them and put regular modern clamps on?