Non-Verizon sim, broken sms with 5.0 root topic

So I've replicated this problem three or four times, after which I've given up on updating to 5.0 until I have some solid solutions. Whenever I try to flash one of the rooted OA8 roms here on xda I lose the ability to send sms, that is literally the only thing that is broken (4g works, calls work, phone activates to towers fine.) My process for flashing these roms has been full wipe > flash rom > reboot download > odin OA8 kernel; that's coming from rooted NK2. I've talked to another user on here who has the same problem and our common thing is that we're both on non-verizon sims (straight talk in my case.) I've tried updating the PRL, wiping cache/dalvik, factory reset. Downgrading back to 4.4.4 fixes it every time, so it's definitely not a network issue. What's the issue here? I realize that those of us with non-verizon plans are the minority here, but if anyone who knows more about this than me has some suggestions, throw them down here.