There was a fella on these forum that offered his Apex plug for $10, because he didn't like it. I wanted to see what CVA was selling to ignite BH, so i purchased it. I have never seen the Optima plug. If it is like the Apex plug, i don't care for what CVA decided to sell.

In my opinion, the BH plug would have been much better with a powder cavity half as deep. This would have resulted in perfect ignition of BH in all temperature. The BH209 Apex plug i have in hand would have been near perfect geometry with a powder cavity half as deep.

Then, after CVA made the powder cavity too deep, they left the flame channel too small for such a short length. The flame channel diameter would have been perfect for the long length of the plug with a half as deep powder cavity. The flame channel as short as it is now, in the plug i have, should be 5/32" diameter.

The Optima plug i modified for you is/was 'optimal'. Of course this is only one man' opinion, however the opinion was formulated by wearing out the barrel of an Accura. You should have kept it. An added benefit of that plug was, when the flash hole eroded to be too large, you could have installed a new vent liner. By adjusting the firing pin bushing to achieve zero blow by, and thus not allowing flame cutting of the primer seat, replacing the vent liner would result in a lifetime breech plug.