Just a bit of info...
During the course of a year, I play on 12' snooker tables...9' american tables...and small 7' bar boxes and English size 7' tables with round snooker type pockets with a 1 7/8 " cue ball and 2' object balls! Going down in size is not a great adjustment , it takes a short time to adjust but going up in size is quite a different animal!
When playing on our normal 9' gold crowns then I go overseas, where there are almost NO 9' american table, I usually take about 2 weeks just to get my "EYES"...there are almost no 12' snooker tables anywhere in the USA, I play nowadays.