NOOOOO!!!! don't cut them!
I'm a neophyte at growing bines, but understand a little bio.
The growth site releases hormones, or chemicals, that govern the plants growth.
Let it just fall over, and hang.
The lower nodes will 'realize' that the 2nd or 3rd lowest node is at the top - they will "know" that the tip has maxed out, and they will branch out.
I do *NOT* know if cutting the tip off will retard the cones' develoment, but I don't recommend it.
just get them out of the gutter.
my 2nd year cuttings are only 3 ft tall, so "Let it RIDE!" you are doing great.