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the front mudguard in particular swings to the side and hits the tyre
Is this the only issue you're trying to solve?
The other potential issues you mentioned don't sound like they impact you at the moment.
In which case I think you want to increase the support on the front of the front mudguard.
I used someone else's pic because it's side on, but you get the idea....
I'd do this first as its the lowest effort. You can buy Gilles Berthoud struts separately so that would be a good route to adding support to the front.
Then probably the 75mm Bluemels Style, as Imo they have a utilitarian charm to them which would suit a functional bike.
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hugo7
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Is this the only issue you're trying to solve
Yeah just this. The rear mudguard does it a little on major bumps but the front is much worse. It's actually towards the bottom of the mudguard where it happens though, the whole thing twists from behind the fork bolt, and the stays do nothing to prevent it moving side to side.
Stiffer stays would surely help but they'd need to more or less replace the existing ones which I'm not sure is possible. Either that or increase the clearance, so it would have to move further to make contact with the tyre. I don't know whether 2mm each side increase, from going up a size in Bluemels would be enough.
lemonade
Bit of a dilemma for me. Currently running 65mm Bluemels on top of 27.5 x 2.25 tyres on my Bridge Club and while they fit, there is too much side-to-side flexibility, and every time I hit a bump, the front mudguard in particular swings to the side and hits the tyre, making an unpleasant and slightly worrying noise. This is possibly also because, while they do fit over the tyres, the tyres are fatter / clearance smaller than SKS recommend. @Haistelija you've got similar sized tyres under the same Bluemels, do they work ok for you?
The frame will happily take much fatter mudguards, but if they are still just as wobbly, I worry the same problem will occur. So that rules out just replacing with 69mm Bluemels for £40, which are in any event only 4mm wider.
I could go for 75mm Bluemels Style for £55. These are both significantly fatter, and possibly going to be less flexy due to the stays being a single rod that is bent around and clipped in place, rather than each side having its own straight rod held in place with the traditional fiddly grabber things? They are aesthetically very challenging though.
Alternatively I could spring for metal mudguards, which would surely be stiffer. I've used Velo Orange and Gilles Berthoud in the past very happily but they don't make any fat enough. I'm not prepared to do any re-radiusing. PDW do 650Beast in 65mm for £120ish but a) they are seemingly out of stock everywhere and b) I'd still technically be exceeding the manufacturer recommended max tyre size, which for the PDWs is 2.2".
So, that brings me to the the £190 Simworks/Honjo 74mm. This is obviously far more than I'd like to spend on mudguards but if they are gonna do a brilliant job and last forever, I could stomach it. But @Skülly says he's broken two pairs and Simworks themselves provide an extremely un-reassuring article washing their hands of any responsibility for cracks.
So what would you do if you were me? Stick to plastic, cheap and v ugly with Bluemels Style? Or go for Honjo and risk the world's most expensive mudguards cracking in short order?