Sweet Autumn Clematis in trouble

I have 3 beautiful, easy to grow sweet autumn clematis in their second
year on a trellis on my garage wall.  The trellis is 6 plus feet but the
cleamtis wants to keep on going---AND ITS ONLY JULY 1.

This week I extended the trellis with sturdy strings held up by nails
but foresee trouble ahead.  It is just too heavy.

Should I:
    (A)  cut in back--and if so, how much
    (B)   cut some of its stems back to the ground -- which is pretty
difficult to do with clematis--impossible I think
    (C) any other suggestions.

It is fall blooming and is not yet in bud.

Second question.  Should I have planted 2 plants instead of three
originally on my 12 foot wall, and should I remove one next year?
    Many thanks for your help, nice people, h=and have a happy
Independence day weekend

Nancy Shlaes deGrazia
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