I had to check out this thread because what I do is so easy and works, I was wondering. When I started out, I didn't starch at all. As I've been trying to learn and present my best work, I like the starch look. I use Best Press starch.
I'm one of those pre wash people unless it's Northcott, Benartex or Marcus Bros fabric. I spray it on before I cut so the fabric is crisp and ready to be cut. Also I spray when I set the seam and press open the block. I had never heard of flaking nor have I ever had a problem with it. Never had a problem with Best Press building up on my iron.