I've been doing my research on how to balance a kegging system. It appears to me that the two most common ID's of tubing for the beer lines is either 3/16" or 1/4".
Going off the beer line resistance table HERE
, It looks like the average resistance for the 3/16" is a good bit more than the 1/4".
Which ID are you using? Any good reasons to choose one over the other?