This linked google doc contains my latest settings for Panasonic VT60. They might also apply to other Panasonic TVs.
The green cell indicates whether the section is for optim or generic modes. The optim section contains specific settings for Capcom fighting games on the Saturn and also for SNES 8:7 AR (only at Lx3 though, there are some issues with Lx4 – see the notes column)
The very first adjustment should be to increase V.active to 256. Then reduce V.backporch until an image appears on screen. Then do all the other adjustments, and finally, reduce V.active to 240. You should now be looking at some sweet-arse graphics.