I hadn't considered alnico iv, I probably wrongly assumed that high gain chords wouldn't hold together and would break up too quickly. I had a crawler in a strat and just didn't get on with it for that reason, replacing it with a black dog smoothed the chord work out nicely, but that was a very different band / musical style / guitar / amp so I can't gauge the black dogs suitability for the custom 22 even though I have form with the pickup itself.
I have ordered an aged BD for the SC245, will see how that goes.
As for the 22, I will have to consider the abraxas as it has been recommended, not many full on sound files available, do chords hold together or are they a bit loose?
I do have a boost, just more than a little OTT with the nailbombs and its just another pedal to hit so a 12-14k pickup that has sizzle of it's own sounds good, a 12k black dog would definitely float my boat.
James