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N-back hack. (Infohazard!) There is a way to increase one's performance in N-back, but it is almost cheating and N- back will stop to be a measure of one's short-term memory. The idea is to imagine writing all the numbers on a chalkboard in a row, as they are coming. Like 3, 7, 19, 23. After that, you just read the needed number from the string, which is located N positions back. You don't need to have a very strong visual memory or imagination to get a boost in your N-back results. I tried it a couple of times and get bored with N-back.
Wow. It's rare that I'm surprised by the variance in internal mental imagery among people, but this one caught me. I'd assumed that most people who have this style of imagination/memory were ALREADY doing this. I don't know how to remember things without a (mental) visualization.