Dry grape whole corn bread

I made with dry grapes the whole corn bread, the original receipt is
without dry grapes. I found the receipt from here. The result is the
good, but next time when I must put a cover before waterproofing the
bread, if I put after, the bread will deflate slightly, because the
cover will touch the increasing paste. Well, the nearest time I want
to try to employ reducing instead of oil, to make it softer. Whole
bread promoter of gram of milk powder2 of gram of the gram sugar20 of
the gram salt20 of the gram yeast20 of corn 15 of gram of the bread
flour100 of the gram Ingredients:900 (I not the gram it)40 used making
cook the ice waterMethod:-could of oil620 ml the flour with bread in
basin-in the basin separated to soak with whole corn half water-to add
it whole corn of steeping in the flour to bread, sweetens, yeast,
mixture of dried milk it during 2 minutes, to add the remainder of the
water of ice, to mix it during 10 minutes, to add oil and to mix it
for 5 minutes-leave the paste during 10 minutes rising-for 200gr each
one of the paste, round him, half of cover of the leave of mould it
for 1 a.m. or more 220C during 25 minutes with cover on the top.