This a Landrace strain, i dont want them to grow v...

Here is what I have learned, with my plants at least. I FIMmed hoping to slow 2 girls down and they just rocketed right thru the FIM. In hindsight I should have topped first and then FIMmed meristem and branches to manage canopy height. I cut right at where you show on one and lower on the other just to experiment. I couldn't tell a change. I will be posting some new pics today start of wk. 6 veg. They might illustrate what FIMming did for me. Best of luck brother!

Solid advice below. I would say topping is the way to go. Fimming is going to cause a lot more branching in a small area. It's really cool looking but does tend to grow tight together not as good airflow. Good luck with your girl. Also from the plants I filmed in the past,it's took twice as long to start growing again.

Just do a normal topping, "Fimming" in my experience seems rather traumatic with recovery taking much, much longer than normal topping and is not always successful. If you do insist on trying Fimming, you need to cut lower than the line you drew, almost parallel with the node.

@WeedDude No I would take the top off rather than fim it when the new nodes grow you will end up with two main branches that can then be tied down and topped once more and as it develops you keep using lst to create a flat even canopy to minimise the height . like what i did with this plant growdiaries.com/diaries/98631-grow-journal-by-grey-wolf