Basically, in scrog, you're trying to grow the veg vertically asap to create a canopy asap and flower asap once the space/light penetration is depleted by the canopy you created.
The definition of a canopy is that which blocks what's beneath it.
Once you have your canopy, everything below it is severely hindered, most scrog guys will lollypop that bottom portion the plant put energy into creating, and use the bed of greenery halfway up the plant to fuel top bud development to hopefully grow as big and tall as possible, like hopefully 1.5-2' tall, because that's pretty much all the buds because you've modified the plant in such a way.
Way more efficient in a warehouse type situation where you're constantly pumping dozens if not hundreds of clones(usually spindly) through an extremely rapid veg, IMO way, way over used in a lot of home situations. Rush to get to bloom. And usually people end up flowering plants that aren't fully mature/developed in a lot of ways, roots, stems, side branching, and run into problems in the two month bloom because they flipped a plant that, sure, grew, but wouldn't survive two nights if transplanted to a cozy hill side.
Like your situation, the dimensions just don't make sense. IMO, take the time to nail the veg, let it grow through some stages, grow awesome soil/media, thick roots, strong stems, compact structure. On the day you flip, flip the healthiest little muscle hampster it can be. It doesn't matter what happened in veg, the plant could have been on it's death bed at one point, but if it's 100% vibrant on day of flip, can;t ask for more. Conversely, a perfect veg doesn't matter if things go south right before/after you flip, and a nominally "healthy", relatively immature plant at time of flip will have many weak links going into bloom that may pop up.