Just steam-of-consciousness 2¢, feel free to ignore?
I'd look at the 270 chamber outline and wall thickness with an eye toward making the circumference some fraction of a regular arc (if not the entire OD), and the bowl's curved wall opposite the plug into a 3-dimensional spherical section.
Yes, it's more work, and it may not be possible (or only to such a limited extent that no cost-benefit argument can be made).
What this will do, if successful, is allow a piston with a regular geometric dome on the non-plug side which can match the wall's curvature very tightly for squish, prevent charge trapping, and insure minimum chamber volume except where you want it. You will also have interchangeable pistons, and a re-order (G_d forbid) will not take 4 hours of hand prep to "fit" the chamber.
Not everyone will agree, but such a dome/wall interface is an excellent candidate for Singh grooves arrayed radially and leading from the deck height across the dome and ending converged at the plug's location. This will allow easier escape of charge behind the dome approaching TDC, and also assist turbulence.
I picture the dome as the inverse of a "heart" shape for the open volume to give generous clearance around both valves, and tall enough to drop the volume.
