I've worked on this problem several times. In the early days, when editing wasn't possible it caused serious problems. Editing is best done with a non-box preview, as you better see what you're doing. And sometimes instances are not shown in box, but are in smooth shaded, e.g.
I often have to set up evenly spaced lines of trees along roads, and also got problems when the pop was attached to the ground, and angled. If at all possible (flat ground) a floating pop better aligns and doesn't miss instances. I wonder why that is, and whether it can be helped.
Btw. that pavement; does it only seem to bend with the warped angles, or is it? I mean the dividing , perpendicular lines. We've worked on that problem too, getting lines perpendicular to the direction of the warp bend with it, so to speak.