The E4/S4/B6 FoB is a very potent pretender chassis for Blood nations, I've found - but for some reason hadn't tried it with Abysia yet. This looks fun, I like the way you think.
Personally I would make the first few Bloodstones (until Illearth can take over making them) more of a priority before starting the contracts. It will only mean a few Devils either way, but if you can get the E gems to start, that is a payoff that will ramp up more quickly. Abysia has a really fun toy to spend extra E gems on.
