Looking good.
The trouble with fimming is there are too many undeveloped growth points that all want a share of the available energy - they don't grow as fast as the fewer (more developed) growth points that grow after topping.
I suppose fimming is meant to create shorter more compact plants.
I prefer topping, you still get great branching but you also get a more open and healthy plant (light penetration and air circulation).
How long till you switch to 12/12?