I had a hard time taking off the lowers in the beginning, but after finding it a pain in the ass to have to trim all the skinny branches with popcorn buds, I am now #nolarf!
If you want the middle to fill in the best thing you can do is keep the mains lower than where they come out of the trunk (slowly so as not to break anything!). That sends the growth hormones to the middle.
If you want the middle to fill in the best thing you can do is keep the mains lower than where they come out of the trunk (slowly so as not to break anything!). That sends the growth hormones to the middle.