uneeq: “If I live in a house where home made corn bread is regarded as a questionable product, I am fine according to the Rashba, because I will come to ask someone and will get the right answer.”
“if one changed the appearance of the bread it is permitted, because one who sees it will know that its appearance was only changed to make a noticeable difference (heker) and will ask and be told”
You emphasised the wrong words. My point is that noone will ask “why did you make corn-bread, is it fleishig?”, they will assume it was done for the taste, just like an English muffin. Therefore, the siman is inconsequential.