looking good. i would lollipop all but them main 4 colas however due to the size of your plant i think you would benefit from using string attached to the pot and pulling the top 4 branches down in a north south east west fashion and bending them so that they are just lower then the main canopy below them.
if not the top 4 colas will end up stretching much taller then the rest, so much so all the rest of the plant will be to far from the light.
you are trying to get as many budsites in the sweet spot of the light.
hope this helps n makes sense!!
p.s im a massive fan of the gas lantern light routine, i personally think its much much better and i belive WILL increase yeild. i have been growing for years under 18/6 and 12/12 now ive changed i think of all the lecy i could have saved!!!