Those will get quite large if you flip them now.
Training definitely going to help.
I'd use some stakes to help spread out the canopy.
Just as an example, here are a few pheno's I'm running in my 4x4.
Because I only let them veg long enough to get a cutting for a clone, they start with 3 node sets and are about 6" tall when I flip them.
They are about 25 days in flower now and about 2' now.
photos.app.goo.gl