I'm not sure where SSPX would be providing such confessors that there aren't other alternatives, maybe you could clear that up a bit.
I suggest you read "Goodbye, Good Men: How Liberals Brought Corruption into the Catholic Church" by Michael Rose and "Amchurch Comes Out: The U.S. Bishops, Pedophile Scandals and the Homosexual Agenda" by Paul Likoudis for further insight.
If the choice is between confessing to your parish priest who is openly living with his boyfriend or a priest who belongs to SSPX, there would seem to be "just cause" to opt for the latter. Faculties or not, perverted priests are OBJECTIVELY not trustworthy to hear one's confession. The sad truth is that when obedient, orthodox priests are thin on the ground, Catholics may be forced to make such choices. This is where Can. 1335 and prudential judgment seem to apply.