Hi Bill,I heard somewhere the 7B-SST2,get you around 98%to where the 28s are at,-extra power and weight.
what pre are you using,I had a grand experience with the 26 for a few days,I was so charged up I ordered one.I thought my Av-8 was good but this is

,i think I reached the summit on the mountain,I'm sure it's a combination of all,26 BCD-1,28s,Torus,cables ect.The 26 just brought everything together,
beautifully.Any cograts on the 7s.