What would you do?

I agree
You just can't beat a well designed engine. For me, not a builder, it cost's what it costs. The paybacks come in the 100,000 miles I'm gonna drive it, and the surprisingly low ET, and the number of targets it hits. I like the way you science it out and the attention to details. I like that and so what you do is what I would like to have done to my engines,.... and already did, with a super pay-off, AND, I never say a single bad word about the designer of my combo,or how much it cost; lol.
Nice work.