Get a net in, put it about 8-10 inches below the top of the tallest spot, massage the stems an inch or two below the net until the stem 'crunches' and goes soft and pliable. Soften the stem at least an inch or so and gradually bend it over 90 degrees and tuck it under the net. Get all those tall stems bent back down to the same level, and then adjust your lighting accordingly.
You basically have three options:
1. bend
2. cut
3. raise light/get taller tent.
At this stage it's not good to cut - too late, but either the other options will work. Obviously swapping the tent for a taller one is drastic - but it can be done, and I did it myself last month in mid-flower. But unless your light is the sun, raising it more and more just starves the rest of the plant for light. You need to engineer a canopy about 12 thick with all the tops at the same level.
So bend, bend, bend.