Realize this is an old post, but I do have some advice. I have QRings with a Sram red yaw mechanical, and there are a couple things that you need to have PERFECT in order for this setup to work. I've discovered these couple items through online research after having at least 4 bike mechanics completely fail at fixing the same issue you describe, chain falls into the frame when shifting from small to large ring in front.
1. Set the gap between the bottom of your FD cage and the tallest tooth of your large QRing to exactly 1.5 mm. See Rotor's YouTube video on this for some guidance on where to measure. Rotor says 1.5 to 2mm gap is ok in the video, but set it to 1.5mm.
2. This is CRITICAL: Make sure the outside of the FD cage, when adjusted to the big ring position, is exactly parallel to the QRing. Then set your inner/outer limits accordingly to prevent any chain rub or over travel.
That should drastically improve your shifting. Hope this helps someone.
1. Set the gap between the bottom of your FD cage and the tallest tooth of your large QRing to exactly 1.5 mm. See Rotor's YouTube video on this for some guidance on where to measure. Rotor says 1.5 to 2mm gap is ok in the video, but set it to 1.5mm.
2. This is CRITICAL: Make sure the outside of the FD cage, when adjusted to the big ring position, is exactly parallel to the QRing. Then set your inner/outer limits accordingly to prevent any chain rub or over travel.
That should drastically improve your shifting. Hope this helps someone.