whut question hun? Why your goldfish are showing signs of SBD when you soak your pellets? Since i am not sure of the question, ill answer that one

SBD can be caused by many things, swallowing air bubbles, high nitrates, constipation, egg-impaction, eating dry foods and injesting air that way (which isnt your case) internal bacterial or parasites, ect ect. The point being, the food might not be the culprit. Heck, fancy goldfish can just get SBD because of their bodies being shaped the way they are. The only thing to do would be to post in the desease section and see if some one can narrow it down there.
Heres where i think you got confused - The whole ash buisness. I think maniacholic was only referencing the fact of the high ash to say he doesnt have to soak the food, dont even worry about all that, your food is ok. And as i have shown you, SBD can be caused by alot of stuff.
Hope ive helped. Good Luck - Meg
ETA - found another Question, food with high ash content isnt nessasarily BAD. I use wardleys all the time. Pellets and Flakes. High ash doesnt make it bad. It is of lower quality yes, but not bad. Kinda like the difference between regular mustard and gourmet dijon. (for lack of a better anology)