Hey Steve, good to hear from you again.
I managed most of the worst peaks/dips with just ~3 filters, but of course tinkered with it further until I had it looking like it does above... I think I ended up with ~10 filters, most of which were minor tweaks after the first few major adjustments.
It's admittedly a sickness I have that demands that I tinker to see how flat I can make the curve, even though I realize that beyond the first few, the audible difference is entirely negligible - but isn't the graph pretty?!
Jason