Could let her go and then trim off the lower growth that will not get any light... Looks like you should have a bunch of tops for a SOG
Or top again at a lower point an eliminate the additional, however I think that would be wasteful as it is taking out top growth to accommodate lower...
Just my 2 cents..
PS: great job on the grow, nice to see that type of grow from 300w ... I am just getting to the end of my first 300w grow, but far smaller as I did not have a lot of faith in the cheap light i bought.. Seems to do the job contrary to popular opinion...