How should I best deal with negative fogging with INSTANT NEGATIVE only?

I expose the negative only at about ISO 150 and shorten the development time to 2 minutes, and very quickly dunk the negative in fixer after peeling. This reduces the base fog density and still gives a moderately dense negative. To scan I set the V700 black point up 2-3% from the bottom. Most of the photos I've published were scanned that way.  (Bob Crowley)