I wouldn't add whole oranges. For citruses in general, you want to use the zest only - that's the colored (orange) part of the peel. Some add it directly to their beer, I prefer to soak it in vodka for a couple of days first. I'd use the zest of two or three oranges for 5-7 days before bottling (add after fermentation is complete).
Stop using so much caramel malt. Your beer will thank you.
(yes, Carapils is a caramel malt...so is Special B)
pujwI HIq Mild Ale
KPA Khitomer Pale Ale
Quadro (quadrotriticale ale)
Beer of Honor
Black Bat'Leth Stout
Targ's Blood Nut Brown Ale
Supersecret sour beer experiment v1.0