Congratulations! This seems to be a very high quality 300b SET amplifier. I believe that you made a wise decision to choose top tier 300b tubes. You may as well use this level of tube to get the most of an amplifier of this caliber. This SET would no doubt sound good with the lower cost 300b but not to its fullest sonic potential.
Curious that the reviewer made no comparison with his Border Patrol 300b amplifier. I'm convinced that both sound fabulous but wonder how they differ in their respective presentations.
Charles