SCs inability with tomatoes

I just never seem to have the yield from them that other people get. No matter what variety. I think I do everything right (obviously missing something). They’re planted in raised beds or very large pots (depending on variety) I try to give them space, I give the support, feed weekly after first flowers, I pinch out armpits. I talk nicely to them! But still a pitiful production. It might be the varieties I’m choosing, but they can’t all be under achievers, can they. I choose them in a very scientific manner…………..by the names     . 
For example Black Russian. Love that tom. But I get about 4 ripe and a few under sized green. Everyone else has ladened trusses. Same with buffalo horn, love that one too.

My Buffalo Horn (seeds originally from you) this year is incredibly prolific but unfortunately many of the gh toms have once again suffered greenback, fluctuations in temperature probably the cause.