Tried out ChevyNo1's 800 ULV kernel and my phone seems to run it without any stability problems, but I let it run for the day and noticed above average temps for idle and quick battery drain. Battery History pretty much says my phone isn't sleeping, so I went to check logs. I spotted the error "dspbridge: timed out waiting for mailbox" being spammed constantly.
I have not had this problem running Slayer's, P3Droid's, or cvpcs's LV kernels. Tried a couple reboots but the same problem came back within a few minutes of having the phone on. Flashing back to cvpcs's 125-800 LV kernel resolved the issue.
Note that I am running stock FRG22D rather than any custom ROM.