Welcome to the QB from SE Michigan! You are not alone when it comes to flying geese. I use to struggle with them a great deal. Before I got the Accuquilt system I found myself squaring them up and they were always smaller than I wanted them to be. I finally looked on You Tube and found a video that Elenore Burns did and that was a big help. Like you I am self taught. I am still looking forward to taking my first quilting class some day. For me ease with Flying Geese came with Accuquilt. I just finished a block this morning with Flying Geese and they came out perfect and right on point as they should. Right now I have a block laid out on my cutting table that has 8 flying geese. I took a break just to look on the QB and found your concern.
https://www.youtube.com/watch?v=J5Hir25m1NQ Elenore Burns Flying Geese .