Minimal clearance mudguards - please help

I have a Focus Cayo and I have just upgraded the tyres to gp4000s which give me a lot more confidence.

However, I cannot get mudguards to fit the tight frame. I tried Crud Roadracer mk2 but they were too tight even after filing down. No fear, I read that the SKS raceblades can fit practically any bike. Nope, the tyres are stuck to the mudguard join under the rear caliper even though they are not fully inflated.

Any ideas please as this is costing me a fortune and time and is surprisingly stressful.

thanks