I think you're on the right tack DrPhil. I have found times for dilute Selectrol Soft (1:9) as long as 30 minutes. Additionally, the 'hard' developer is much less likely to compromise the soft developer by allowing time in a water bath prior to let it neutralize/exhaust; a good minute seems to work and account for that minute when you determine your total development. It is an important step. Also, the dilute soft developer does not have the tray life you might think it does.
Originally Posted by DrPhil