Twist evenly

I created a long square tube, then created a straight line running through the middle of it lengthwise.
I used the ‘twist’ operation to put a few twists into it, then flowed it around a cylinder.

The issue started before the cylinder, because the ends are not as tightly twisted as the middle, as you can see on the drawing.

How do I twist the entire thing evenly?
Can I twist a square tube that’s around a cylinder in the first place?
How I do get the two ends to line up at the end so they match up without having to guess?

Thank you.

Choose Infinite=yes in the Twist options

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