Practice helps - none of my first stars were what I really hoped they would be. As I did them I learned methods that worked for me. So when I click on your image - it gets blown up. What I see is that the problems are not consistent. By that I mean, one of the valleys of the star points is dead spot on (another two are very close) while the others are off. Also the four patches on the top center are pretty close while the set at the bottom are not and the final sizes are not the same either. What is the final size of these blocks?
I hope I have your question correct. When I do this type of block, I measure each subset. In doing that, I also measure , in the case of the 4patch. if the center seam is actually in the center. On the point of the stars, I measure the entire rectangle and also check for the 1/4" seams at the spot where the sides form the V.
When I assemble the Star Points to the center, I put a pin vertically through the bottom of the V and then through its corresponding seam on the 4 patch where I want it to match. I then place pins on either side- removing the vertical pin afterwards. I use that method sometimes when I sew 4patches to one another as well.
Whn done I also, measure the final blocks, measuring the overall size and the location of the the two vertical seams and horizontal seams to one another and make sure they are where they are supposed to be.
My bet is that your 4patches were not the exact same size after being sewn and that is some cases at the V on the star points, there were instances where you did not have your 1/4" seam. Hope this helps. Keep asking questions
