Well, both Charlie Watts and Ringo Starr used the smaller 20" bass drum in the beginning of their careers with their bands. David Garibaldi said he used the 20" bass drum for all those early recordings with Tower of Power. And Danny Seraphine of Chicago was either using a 20 or an 18 bass drum for their groundbreaking music too. I think you're ok if you decided to play something other than jazz with what you haveI love my 20x14! However I only play Jazz...
Which EMAD ring do you use? IME the large one tends to raise the pitch of the drum a bit. So for a 20" I would think either the small ring or no ring at all. The last 20" I had loved the SKII.Gotta echo most of what's been said. My current fave kick is a Keystone 16x20, tuned for punch and tone. It cuts above a low bass, so it's easily heard in the mix. But it also has a nice thump and punch, so it sounds like a 22 or even a tightish 24". Not sure if it's the shell (oak & maple) or the size, or the heads (clear EMAD, Ludwig reso, no port no padding.) but it just sounds great. I have a Legacy kick that's 14x20 and it also has a great punch and cuts through the mix.
Recorded, they have a surprising amoujnt of low end, and playing wise, to me they feel better than a larger drum. Also, they fit in the Smart car easier than a 16x26"!