Great minds think alike, Ed. I printed some of my older 8x10 negatives last weekend, using Michael's Amidol formula for the first time. Really good results. Much better than the amidol formulae available from Photographer's Formulary.
For those who would like to try this amidol formula, but don't have a scale, i.e., don't mix their own, be aware that Michael Jacobson at ArtCraft Chemicals will measure the individual chemicals in 1 or 3 liter quantities and pack it up in indivdual packets. All you have to do is pour it into water and go. Michael was great to deal with and his prices are very competitive.
My 8x10s were shot with a range of films, HP5, Tri-X, BPF, Delta 100, etc. One thing I noticed was that my pictures shot with Agfapan 100 and developed in pyro were orders of magnitude better than anything else I had used, in terms of local contrast and shadow detail. Unfortunately, APX100 is no longer made in sizes larger than 4x5. My new default is Fuji Acros 100 in 8x10 but it is very expensive and fairly slow. I'd love to hear if anyone has a good alternative. thanks.