x264 parameters for encoding 3D half-SBS/OU

[syrist]

Does anybody have any good x264 parameter suggestions when encoding a 3D source to 1080p half-SBS or half-OU?

I just wasn't sure if there's ideal parameters for 3D encoding since I'm assuming any slight difference in artifacts between the left and right eyes (when combined and viewed in 3D) would be very noticeable.

Currently, I'm using these parameters which give me really good results but take a very long time (11 fps on an Intel Core i7-3930K PC):

--crf 18 --tune film --ref 4 --me umh --direct auto --deblock -3:-3 --bframes 6 --subme 10 --trellis 2 --merange 32 --open-gop

Any feedback or suggestions?

-Pete