cp, I've done a bit of this with many of the same chemicals and had decent results but haven't refined it yet. What I don't understand is after the bleach process you can work with the lights on, but then holding it up to a light bulb. What about all the exposure the film is getting when the regular lights are one? See what i'm getting at?
The important bit is getting the original negative developed. That is the "Mask" for the subsequent reversal. Once that has been bleached out, the remaining emulsion is there to "fill in" the gaps. Its developed to completion. As its there to fill in the gaps left over, more exposure over and above whats required to get maximum density doesn't really matter, the image has already been set as blank bits.
"Flatter Me, and I May Not Believe You. Criticize Me, and I May Not like You. Ignore Me, and I May Not Forgive You. Encourage Me, and I Will Not Forget You."