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