I'm a newb to this site, but not an engine newb. So, I gotta ask....are you worried about the oil cooling dropping temps too low? High RPMs with low oil temps could result in poor oiling. If nothing else, I'd throw a temp gauge at it the first few times you take it out to see just how low it gets on a cool spring morning. At twice the oil capacity and infinitely more cooling, its something to consider.
The tank....nice job! It looks amazing!