Unfortunately, the token marker size is static. The truth is,if they were smaller, people would find them too small to be useful, and if they were too large, they would obscure the token. There's not really a good one-size-fits-all solution that would work for everybody. My only advice would be to look for a set that has enough variation and clarity to be easily read at small size. I have designed a set with this intent, if you'd like to look them over . But there are many sets in the marketplace that may work better for you.