How to avoid performance problems using HDR Cameras (in VR)

Hi.

I am experiencing strange performance problems in a particular scene in my game. The scene has mostly transparent Objects and in combination with HDR cameras the image stutters severely when rotating my head (Oculus Rift). The problem doesn't come from a lack of performance (using a GTX980TI).

The only working way to get smooth motion i found was to enable MSAA in the settings (which disables HDR Floating Buffers). This is bizarr, enabling Antialiasing to GAIN performance.

The other strange thing is that in the profiler i am always above 200fps (with and without the MSAA), still i get stutter.

This is soo frustrating as i heavily rely on HDR in my scenes. I know what i wrote is very cryptic but maybe someone encountered a similar problem in their project or has an idea what i could try to solve the problem. I am using the latest Oculus SDK and Unity 5.3.4p3

Thank you for reading!