Scrogging a 2 and 4 week stretch

So in my scrog tent i run 2 strains i close match.

Thistime i have 2 strains that dont match lol.

If you had a 4 week stretching plant and another that was only avg stretch for 2 weekish...

Both are germinated now.

How would you controll to fill screen.

I have 4 1 side 4 the other
but 1 screens gona fill up quicker? So thinking about being heavy on thw trimming on my big stretcher and hold back on the other strain before i flip flower?

Or run the big stretch down the back smaller at front? And let em get their height lol.

Train or top the stretchers so they will be even after stretch.