If it were me I think I'd do the EWC slurry. I don't suppose you know anyone that makes their own worm castings, do you?
EWC is IMHO the single most critical amendment. It has huge abilities to set things straight. A well built soil is almost set and forget.
If you'll let me, next time I would hook you up with ROLS recipe. Cheaper, easier, better, more pest free, tastier. I'll walk you through the whole process if you like.