Ok Brian, lets start with the development numbers. Most people who calibrate their exposures for zone system use a 5 stop spread between the shadow with detail and the highlight with detail. In the example you gave of your first exposure, if you had the shadows at 5.6 and the highlights at 22, that is only a 3 stop spread, how many more stops you need to bring it up to the 5 stop spread?....2, so your N number would be N+2, or normal development plus 2 stops. Lets say for example your metering had given you the numbers 5.6 for the low and 64 for the high, this is a 6 stop spread, what do you have to do to bring it to 5?.....take one stop off, so your N number would have been N-1. I hope this explains it a little.
Originally Posted by bpm32
For your negative, your exposure tells me you were shooting early in the morning, late in the afternoon or in an overcast day, you have a low contrast scene, since you have already taken the exposure, at this point you can develop your negative normally and when you are getting ready to print it use a high grade contrast paper, something like grade 4. The negative will be overexposed, but will still be printable.
There are other techniques like bleaching and redeveloping, intensification, etc. But IMO is better not to mess with them, unless the negative is very valuable and impossible to re shoot.