The thing that works best for me is to press all of my seams OPEN when I make pinwheel blocks. I find that even when they are "nested" and pinned the machine will often "push" the blocks out of whack. So, I press all the seams open and the machine does much better without the bulk. Then the points match as well as I can pin them!
I will have to try the glue trick as I have just started a scrappy pinwheel quilt that I hope will be Queen size! Thanks for the tip. :)
Good luck with your blocks!