I'm pretty sure I'm saving my SMS to my SD card, but if that sounds wrong, let me know and I'll see if I can find out what I meant...basically, I'm not saving them to my SIM card (so am I right in assuming it's going to my SD card?).
As for a), all of my settings are the same as suggested in that thread.
as for b), I'm almost positive I've done everything. What's the link to the thread again? (I'll search, but perhaps your response will be quicker)
and I'm using OS v18.104.22.168 (Platform 22.214.171.124)