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You are correct.
No one has come up with a way in theory or practice to inject water on a gasoline engine at light load and increase fuel economy.
You found the only way to use water to increase fuel economy on a gasser, you put together a high compression engine setup like what you have, drive it around normally, with no water injection at light load and use water or water alcohol to increase driveability under high load.
The only other way water might be used to increase fuel ecomomy is to use steam in place of or in addition to EGR.
As far as I can tell no one here is about to do that.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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