I dont think I would be chopping anything at this point , I think i would recommend that you keep following the path your taking now and keep LST in a circle until the canopy is even . This might take abit of time but looking over your plants I can see they are abit stressed and I think just chopping down a section would stress out it out further and stunt growth in your plant . Its also looking like your plants suffering from a combination of deficiency ( calmg and nitrogen ) I might recommend that you adjust your nutrient table to fix this . This will encourage your plant to grow vigorously and quickly allowing you train more often reaching your goal of having an even canopy :) I hope this information helps you with your problem :) Happy Growing!