Fimming with with some LST you are providing the same light to all areas of the plant hence getting the same growth from each MC's, THE PLANT JUST BUSHES UP MORE, and should be done above the 6th node 2-3 weeks before putting in to flower so the plant has time to recover. The LST low stress training can be started as soon as the plant pops the ground if you desire. The purpose is to build an even canopy.Whats better topping or fimming and when should it be done??