I don’t think zodiac cycles need to account for leap years, since it’s the leap years that account for things to make dates align. If by wobble you mean something like the tilt of the axis of rotation changing, then yeah, that’d mess things up - otherwise, I think the constellations are basically just based on where the sun is, and this which direction your part of the earth is facing during the night. If I’m correct, then I suspect the zodiacs do still align, but the constellations will differ depending on your latitude…