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.