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Clematis free for all

Hello, haven't been active for a while but have been keeping up with you all. I made a mistake with my wooden arch 1) I didn't put string/wire in between all the gaps so my Clems just hang off the front but 2) most importantly, I have the president and Nelly Moser on either side, they've been drowned out by the montana. I do get flowers but nothing much.
Can I ask what you would do please? Shall I or can I prune the 2 as group 3 this winter/spring ? Do you think that will help them perform against the montana? Or get them out altogether and replant elsewhere?

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Nelly Moser and The President are both group 2 and both get to between 2 and 4 m high but maybe this coming spring it would be a good idea to treat them both as group 3s and prune them back hard or at least to the lowest pairs of buds so you can clear away the top growth and add extra wires.
After pruning next spring, give them both a good deep drink - at least 10 litres - and then a generous handful of slow release clematis, rose or tomato feed followed by a good mulch of well-rotted manure. Train in the new growth across the wires as it appears and before it tangles or just heads up straight in a column. Treat as group 2s in future years.
Not to worry. Is the montana accessible enough that you could cut it back, lift it and plant elsewhere, and then your other two would be fine on the arch? They're tough things, so they don't mind being cut back hard.
I'd agree with @Obelixx - you can cut the other two back so that you can train them in nicely for future years
I live in west central Scotland - not where that photo is...
It might be worth potting up the montana and keeping it until spring to replant. It will depend on the size of the rootball and how easy it is to get out though. If it comes out easily, you can just replant
I live in west central Scotland - not where that photo is...
There's a house not far from me which has a very mature one on the front wall, adjoining their garage. They've recently cut it right back to about head height, and it'll be fine. The 'trunks' on it are the thickness of my leg
I look exactly like that picture.....
I live in west central Scotland - not where that photo is...