I had the same issue on my 6.4l, puking out the degas while under boost. Replaced the headgaskets and studded it along with a few other upgrades since it was all apart. no more puking!!
I was getting high trans temp while pulling my toy hauler, flushed the fluid and added the mishimoto trans fluid radiator and haven't had problems since
my oil temps would climb unloaded on the freeway all the time 250+ until I bought the Bullet Proof Diesel 2008-2010 6.4L F-Series Oil Cooler System Half Kit. was a pain to install because I had an aftermarket bumper but my oil temps are normal now since the installation.