Which wideband are you using? My LC-1 once ended up with a crazy multiplication factor on it. I had to do some kind of reset to get it working fine.
My initial thinking is that changing the injector scaling would allow the ECU to compensate better for the changes. I think that parameters like cold start enrichment and tip-in enrichment are probably based on the injector scaling. On the other hand all the tables that depend on load would have to be rescaled. I guess without testing we can't know which method works best.
It will be interesting to see if you get consistent AFRs using this approach.
Looking forward to your progress reports.