Thats not topping. Those leaves give the plant energy to grow.
I think you need to search these threads and find out about growing
from start to finish.
were do you live ask some one that lives close to were you live
environment wise and ask what their doing, are they still vegging or
are they in early bloom? without knowing were you live can't tell you
if you can still top. I wouldn't unless your growing in Canada maybe?????
If I was you and had your knowlage of growwing MJ I think I'd water them
and not do any more of that trimming, pruning tho....
What Books did you read any way??????