It would be interesting to know what you included in your front crossmember reinforcement. There seems to be several different lists of things to do, so it might be helpful to know what was done to see if anything was left out. For instance, did you reinforce the 4 tube nuts used to attach the crossmember?
Were this my project, I would take advantage of the body being on the rotisserie to enlarge and reinforce the exhaust pass through holes in the X member. There is a TigersUnited tech tip on how to do this. They recommend crushing a piece of 3 inch conduit to oval and welding it into a enlarged hole. The guy that fixed my rear spring front hangers recommended not using the conduit because it is galvanized and would give off poisonous fumes when welded. Stripping the zinc with muractic (sp?) acid or something like that would the only way to use the conduit. He said a piece of 3 inch exhaust pipe crushed to oval would be just as good.
I think the tech tip spoke of using a die grinder to enlarge the hole. My guy said a plasma cutter would a lot better.
While not part of the frame, I would expect the upper A arm ball joint mounting rings to be on your list of things to ultimately reinforce.
Cheers, Gene