That's an interesting point - I used to use 3/4 and 1/2, then came down to 1/2 and 1/4.
At the behest of Mr Solomons, I've switched to 1/4, 1/4 - and to be honest I think my break rates have gone up.
I think many people choke too tight, I was certainly a 'bit macho' on it - having two barrels the same and taking that thought out of my mind is far better than 'ooh which barrel shall I use?' and has proved to me that I can comfortably, properly break things as far away as my ability allows with 1/4.
P