The SSPX has constantly shifted back and forth into contradictory positions over the past 40 years. It seems to be part of its nature. There’s nothing I can do to “solve” the mess it has made for itself. All I can say is study your catechism, study the Faith. Don’t rely on the SSPX, nor the Resistance for that matter. There are alternatives to avoid the cognitive dissonance inherent in both groups, but such advice is usually not welcome on an R&R forum. 
Your alternative to the "mess," is, I assume, sedevacantism, is that right?
If sedevacantism is your idea of an "alternative," then it's an alternative that is also a mess.