Rim rub on Klein Quantum

I recently acquired a set of second hand Zipp 303s. However, the rim on the back wheel rubs on the chain stay. I have a set of Mavic cosmic carbon wheels and they fit. I have attached a couple of pictures of the problem.

I was wondering if it is possible to file the down the dropouts 1-2mm of if this will decrease the structural integrity of the bike?

Any help is greatly appreciated!!

Even if you get the wheel to sit a couple of mm further forward, the wheel may spin but it will 100% rub any time you're going up a hill or pedaling out of the saddle. Doesn't look like you will have enough clearance without some more extensive modification

Might be true... It only rubs on certain parts of the rim though. The wheel looks as true as I can see with my bare eyes, but it could be slightly off true? Is it worth taking to the LBS?

I think the problem is you're trying to use way more modern rims than the frame was made for. The latest that frame could have been built is 2002 and you wouldn't find rims with wider than 15mm internal then, your 303's have a 17mm internal and bulge out under the brake track.

But it dosen't seem to be a problem for other people? I've attached some pics of Kleins from the interwebs.
I also know that Thrust build up his Quantum with Light Bicycle rims - they also have an internal diameter of at least 17mm...

Sadly I never came to build them wheels, however, I have used some china carbon hoops on there with success but I don't know the width internally off the top of my head.