Mike, welcome to the world of modular arithmetic.
Imagine it is a clock face and you are step forward each time 30deg in a clockwise fashion.
You now have 12 steps, like the hours on the clock face and things 'reset' at 12 o'clock.
Xara's increments are in the anti-clockwise direction, aligning with how maths functions, so the clock numbers are backwards.
Instead of 30deg, use 55deg.
The stop points are now going to take 18 steps to go perpendicular (0deg) and all of 72 steps to be back at zero.
(0, 55, 110, 165, 220, 275, 330, 25, 80, 135, 190, 245, 300, 355, 50, 105, 160, 215, 270, ...)
For 3deg, you are 30 steps to perpendicular.
12deg will never go perpendicular.
14deg takes 45 steps to go perpendicular.
It's what made Spirograph so popular, c.f. Lissajous Curves.
As I said previously, Xara still locks at 0, 90, 180, 270, regardless of and in addition to the Angle constraint.
As a result of this, I can always set lines to be up, down, left, right, relative to each other.
Xara strangely only allows inputs of 0, 0.1 to 0.9, 1 to 99 (2digits).
Acorn
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