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Wide wheel + rim brake pad clearance issue

I've just bought some new fandangled RR50 wheels, which are 27.5mm wide.  I have an Argon18 Nitrogen, which has special 'aero' TRP rim brakes mounted on the seatstays. 

I've removed the spacers behind the pad holders, and fitted thin pads, but I suspect the pad clearance will still be very tight.  I cannot adjust the caliper any wider as the forward end of the pad holders catch the seatstays.

What would be ideal would be pad holders with the mounting bolt offset a bit more forward... has anyone come across such a thing?

Any other ideas gratefully received. 

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