A couple things. The flowers may not be dry enough yet. Try letting them set for 3-4 days. Another is that your foil may not be smooth enough before starting the flower. If it isn't perfectly smooth, the icing can get in the cracks and stick. Make sure you a re using the silver isde, not the gold side, the gold sticks more. When all else fails, I have actually stuck mine in the freezer to harden them up more and peeled the foil off.
HTH
I wouldn't stick them in the freezer myself. Royal and condensation are not a good match.
You can poke holes in the bottom to help get air up in there.
You can also put them in the oven, with just the oven light on, and that will help dry them out faster.
I can't say I've ever had a problem with condensation by putting them in the freezer. I do like the idea of poking a hole in them though.
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