I've been wearing those asics 2000 series since they came in the 1000s. When I switched from the 2050s to the 2060s, the 2060s felt slightly tighter because they added an extra support band in the shoe along the side. Anyways, I switched from wearing my asics socks (i think they were the kayanos as well...but I honestly can't remember and too many to google) to a pair of super thin thorlos "experia" sock (very thin in the middle but slightly padded on heel and toe) and helped solve my issue. Good luck!