The Right Stuff has let me down because of porosity.
A bit late to the party here, but were you using the pressurized 'cheeze whiz' style can? The gas that's used to pressurize the sealant seems to cause it to form bubbles in the sealant. I haven't had that problem since I quite using the pressurized can. I only use the caulk tubes now.
I think different sealants work for different cases and different areas, for different reasons. It's not written in the 'Engine Book Of The Gods' that one sealant must be used throughout the entire engine, or even in one specific area. The sealant you use on a drag car, that gets regular check-overs, won't necessarily work on an engine meant to go 50,000 miles, and vice versa.