They didn't exactly split the right-wing vote evenly, but FI and FdI still took away enough of it combined with a small but real overperformance by PD in the city of Reggio Calabria and even in some of the surrounding municipalities to have a PD plurality. To be fair right now the most right-wing part of Calabria is probably Vibo Valentia/Gioia Tauro (notice the two Lega constituencies, but also FdI took like 17% in the Vibo Valentia one).
Right, I means Southern Calabria as a whole. If you'd told me a Calabria constituency had voted PD I would have guessed the Cosenza one. The left also surprisingly held the RC mayorship a few months ago (although there might have been actual voter fraud involved there so who knows), so maybe the area is genuinely trending left? No idea what to make of it if so. But if the trend extends all the way to Melito I'll be very happy.
Palermo Centre and Bari Centre may have been won by PD but I left them blank because of the reasons explained in the OP. It didn't win any constituency in Naples though, because M5S was just so effing strong - though it sure as hell won neighbourhoods such as Vomero and Chiaia in a landslide. There's something sweet and sour about BourgEoiS Naples voting PD, ProLetariAn Naples voting M5S, and the right-wing being either crickets or very splintered.
The Virgin Biden/Collins Swing Voter and the Chad Di Maio/De Luca Swing Voter