I'm also considering doing some testing this year at WOT "low boost setting" at 14psi while running lean burn around 22:1 A/F. I've been messing around with my new engine simulator thanks Professor S. Bhattacharjee of San Diego State University.
and have found some very interesting area's that could be tested?
My goals are to use the extra positive air pressure for cooling instead of extra fuel for thermal management. I also will be injecting my "waste solvent" Toluene based as a secondary fuel source for knock suppression.
SI engines with intake manifold injection achieve the lowest fuel consumption at constant engine output dependent on the engine at 20-50% air surplus (lambda = 1.2 - 1.5)" Bosch Automotive Handbook, 8th Edition Page 559.