It's extremely common for the ears on the drainback to curl up. Straightening them out is actually much easier than it seems (which is why it's so easy for them to warp in the first place).
The trick is to flatten out (and a little more) the drain flange. Degrease all the oil off both surfaces. Put a skim coat of orange RTV on the turbo flange, the drain flange and both side of the gasket. Let it 'skin' over for a few minutes, then assemble being careful to disturb the sealant as little as possible.
Snug the bolts down slightly tighter than finger tight. After about 15 minutes fully tighten the two bolts. After doing a heat cycle, it wouldn't be a bad idea to reach under there and snug them up again.