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Because of the forces involved, the rotor side will want to slip backwards when braking, the drivetrain side will want to slip forward, as you found out.
The dropouts of that model are wrong. Both screws are at the back, therefore nothing stops the forward slippage of the drive side. I would fit the screws and run it as close to the front as possible to limit that. I run mine the opposite to how you do, all the way to the front.
They quietly fixed it in the following year models.
Hi forum Straggler owners. I've a question about wheel position in the dropout (mine is, I think, the 2016 model, with the horizontal dropouts). I'm running gears (2x10). I've always positioned the wheel as far to the rear as it'll go in the dropout, without issue, but this evening after fitting a new rear tyre the wheel slipped forward on one side as I got out of the saddle going up a hill. Definitely possible I wasn't paying enough attention when tightening the QR. There are no dropout screws fitted (and haven't been since I bought it new/complete). Should the wheel be all the way back in the dropout? (Does it matter?!) Should I fit dropout screws? Cheers!