Tyre rubbing against the frame

Hi Guys,
So I have an argon 18 E118 2017 time trial bike with Zipp super 9 rear wheel. The rear wheel keeps on rubbing against the left seat stay when I’m standing up. I’ve tried centering the wheel but no success. I manage to get the wheel in between the chainstays but then the wheel is not straight in between the seat stays (sits closer to the left side). I had the same problem with another E118, so don’t think that the frame is the problem. The bike has horizontal drop outs... Does anyone have any idea of what is going on? By the way, The bearings are new, no play in the hub, Zipp quick release is used.
Thanks
So I have an argon 18 E118 2017 time trial bike with Zipp super 9 rear wheel. The rear wheel keeps on rubbing against the left seat stay when I’m standing up. I’ve tried centering the wheel but no success. I manage to get the wheel in between the chainstays but then the wheel is not straight in between the seat stays (sits closer to the left side). I had the same problem with another E118, so don’t think that the frame is the problem. The bike has horizontal drop outs... Does anyone have any idea of what is going on? By the way, The bearings are new, no play in the hub, Zipp quick release is used.
Thanks
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Posts
Tried a Mavic Pro Carbon SL and no rubbing
To be honest I'd be using a bolted skewer as its more secure (not to mention being lighter and more aerodynamic, and at sub £10 they hardly break the bank!).
It can only be one of
Frame flex
Wheel flex/play in hub
Wheel moving slightly in frame