As suspected, the original main colt's on all 4 have continued to maintain its dominance of the growth pattern. The alternate hubs, or side branches, have all accelerated their growth rate but are still a long way behind the main cola, which has been tied down so far that if it could go any lower it would covered in the clay pebbles.
I'll just have to do some serious shaping with the original main coals side branches too maximise the available room left void by the lack of side shoots on the second hub. This should be fun...