For ever I've followed this sequence in preparing Perch to fry.
1. Egg
2. Flour
3. crumbs or ?? similar

By just swapping 1 & 2, it made all the difference in the world! Hard to believe, but saw this sequence on a TV cooking program, tried it and voila !
1. FLOUR
2. Beaten Egg (dip in)
3. crumbs or whatever

Everything stays on the fillet, and turns out nice a brown - appealing!