I have never had a plant get stressed over LST. They seem to love bondage and discipline. I have done ridiculous LST to maximize my 400 watt hps and the plant has always responded explosively with no slow down at all.You could try bending to force the plant horizontal altho don' get too aggressive with it or you could stress your plant out, otherwise good job shes a monster!
damn thats a sweet looking plant, LST'd?Bend 'em over, do it just before your next watering, tie them down with string. It's obv from the pics you don't have enough light.
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don't mean to be rude, but what is your alternative?if u dont want to LST, which i think u should IMO for 2 reasons (u will get more light to the lower brancehes thus increasing your yield AND keep it at a manageable height if height is a concern)