This is driving me mad, every time I do a projection or mirror symettry, I get these stray points that that fly off into space along border edges. They’re damn near impossible to fix, and smoothing or pinching along the edge doesn’t budge them. The only thing that works is moving them one vert at a time, which is almost impossible at level 6 sub divisions. How do I fix this?!
same for me… i haven’t any solution.
First, by going to the lowest subdivision level where the stray point appears, you can fix it without having to move a lot of points.
Second, check out this post.