Maybe we didn't pay proper attention to these strange ZSE things. After the re-wiring I'm listening to them again and comparing to my Swing IE800 and ZS3 (shiny one with Slater mod and news cables), my two previous bassy and outdoors IEMs. The thing is, I think the ZSE sounds a little bit better... but I'm still listening and trying different things. I suspect the price, design and maybe bad QC made many of us forget about them.
Using New Bee tips, Fiio X1 and Xduoo X3 in Rockbox mode, and yes, they seem to need more juice than the other cheaper KZ models, the drivers are probably wired in parallel.
About the re-wiring in the Out of Phase models (remember only to re-wire one side, no matter which one):
1. use a thin knife or cutter along the middle of the plastic capsule with care. Little by little it's going to split the two halves, but there is a little notch near the nozzle holding it together that it's most probably going to crack before everything comes out. (You can see where the notch is in the picture, in the L side one below, the hole in the clear plastic where both halves meet).
2. the black rubber piece holding the cable and the cable itself comes out easily so you can separate them from the two-driver half and identify the two little colored cables.
3. Use the solderer to free the little cables and re-solder them in the reverse order.
4. Get back the cable, rubber piece and tuck everything in as before. Apply some glue to the plastic halves. The notch that was holding it together is probably broken, and the general pressure is gone, but with some glue it appears to hold fine.