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38 total seem a bit much. I'v always had luck with 35 total.

How much do you drive it? Around here, there's a handful of places that sell 100 octane unleaded at the pump for $7.25 a gallon. One place is even open 24hours. You could put a 1/4 tank of that and top off with pump premium. I run straight 100 unleaded, but I have almost 13 to 1. My car loves the stuff!

For longer road trips, I plan on fitting a small 10 or 15 gallon fuel cell filled with leaded 110 that's plumbed to be partially drained into my custom main tank.

I figure I can add 5 gallons of the good stuff just before I fill up with premium unleaded and with the fuel cell, be able to mix up 2 or 3 batches of decent fuel out on the road.

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Wow is all that worth running a little extra compression. If you got rid of the extra weight it would probly be just as fast with a little less compression and 13.1 on 100 octane doesnt seem like much. Most people on here told me to run 110 octane with 12.5 to 1 on my 499 unless maybe just idleing around town.