Repotting and roots spreading

I've got a few clones that i had in 1,5l Cola bottles. They've been repotted for a week now into 3,5l smart pots (which are a lot wider).

A few of those clones are a real shit hermie strain that i obviously dont want so i took them out of the pots. The roots has spread nicely downward, but nothing (from what i could see) to the sides.

Is it always like that when repotting? Maybe it just takes longer time for the roots to spread to the sides? A lot of wasted space otherwise when repotting into wider pots (bigger pots are usually always wider).

When repotting maybe you should roughen up the sides or something to "point" the roots outwards?

My grandmother showed me, and Uncle Ben even brought this up at least once, When transplanting root bound plants to take a sharp knife, and cut about a 1/2" deep 3 cuts down the side of the plant and a couple across the bottom of the plant. Be sure to cut through the big curls.

Ok good to know, thanks. I already did prune the roots at the bottom..

Typically cannabis roots out to the sides more than downwards. Trimming the sides is critical if it has been rootbound.

Ok, thx and yes I read about that recently, that wide pots are better than deep ones.