United Car Tool Torque boxes - can they go in AFTER subframe connectors?

Your front torque boxes really don't matter, but the rear are meant to be welded on BEFORE the sub frame connectors. They don't have to be modified to do that. If you install them after you will have to cut them to fit and it makes a weak intersection. ...

So it doesn't sound like you're contradicting 72Blu's comments except that you have found that it significantly weakens the joint...which presumably defeats the purpose of the connector to some degree...