For starters, Penny Yin is all Freaks and Council, so I'm not sure what TF you were actually discussing.
And there's more to difficulty between radios and TFs than just what you have the difficulty set to. +0/x1 or +4/x8, a single warehouse map of of S/L attackers with nothing stronger than a boss warwolf just isn't that tough compared to, say, a massive ambush of Freaks with tanks, stunners, rezzes, and an AV.