I definitely would flatten it. Imagine someone losing their balance, perhaps being shoved by another chick, and involuntarily landing on the sharp tip of that "twig" with the bottom of their foot. Bumblefoot in the making.
Looks great! I think I see a thorn on the darker/smaller of the two roosts though.
as for acclimation to outside, even if I'm continuing heat outside I still try to find a few days at least, of milder weather so it's not as drastic a change. You bought yourself some time though, with the new...