I trim the roots on my mom's. They are in 2 gal pots and I just take them out every couple months and remove all the wrap around, knock off as much soil as I can leaving about 2/3 of the roots, and replant in fresh soil mix. They usually show very little stress(strain dependent, I'm sure) and then there is a growth explosion for a couple more months. My success rate on clones increased dramatically when I started doing this a few weeks before cutting them. A healthy mom is your best weapon against the clone.