#1...effects placed in Premiere do not make the transition to AE via dynamic link.
#2...in your Premiere Pro Sequence setting , is the "Maximum Bit Depth" box checked?
#1, I understand that certain effects can't translate. I can live with that. I don't think that "curves" ought to be one that doesn't translate, but whatever.
I also think that "replace with AE Composition" should keep the un-translated effects in PR on the new linked comp.
#2, I tried this, but no change.
If you think something doesn't work the way you think it should, filing a feature request is a good way to push it towards happening.
I'd suggest posting over on the AE forum for the AE people to look at the rest of it.