Topping/Fimming before summer solstice

I have 4 unknown origin sativas that I topped the main stem once, and all secondaries once when it had around 6 o 7. Right now each plant has from 16 to 22 main colas each (and some other small ones growing in between nodes). I also did some lst (well not some, a lot). They are only about 1 feet tall.

The summer solstice is coming soon here (around 21 of dec). This is my first time growing outdoors, I read that that's the time the plant starts switching to flowering. Would it be a good idea to top/fim all the colas again? Or is it too late?

Hi mate..id say its a little later than that,but that does depend where you are in the world..where i am situated .plants dont start budding till the beginning of feb some a little earlier and some later.but that would b the average time..i too train mine horizontallyi..topping at the 3rd node so i have 6 branches and peg down the secondaries till i get to about the 14th of jan then let them come up..i would just train them longer and just position them and get it all even.i wouldnt top them again.just my 2c[..Edit...you got a pic of your girls..
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22nd December is our longest day.
22nd March the days will shorten to 12hrs and induce flower.

Our earliest plant is around 22nd October, depends where you plant, assumes the seedling will not turn in the first week because of physical immaturity. Skunk taken outside pre 22nd October flower here.
Without experience with strain, planting well into November should be ok.
Do a few tests in your area.

I don’t bother with pruning etc, only for trellis.
Good luck