Use Rebug's spoofer for other CFWs or install Rebug 4.30.2 and install Rebug Update Package 0.1 for Rebug 4.30 and you'll be able to connect to PSN. I don't think your offline profile will be affected if you get banned but I'm not sure because I have never experienced it myself (and never want to!)
Regarding your save files, yes this is because your saves were created with the patched eboots because apparently some latest games are signing the saves as well to make our lives more difficult when we update our CFW! I know Tomb Raider has this problem as well. This is why I usually prevent updating my CFW while in the middle of a game.
CECHL 500GB: OFW 2.50 > OFW 2.76 > OFW 3.41 w/ dongle > OFW 3.55 > 3.55 kmeaw > Rebug 4.30.1 > Rebug 4.30.2
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Off to my summer vacation, might be AFK for a while... Happy Summer!