I have a DSW top tube pack and on that bike the only issue is it has a round top tube. The rear brake cable pushes it off to the right where it enters that tube.

Yes, sometimes if the rear brake cable goes right under the strap of the Speedpack 480, it can push on the pack a bit.

However, since the introduction of the SP 480, we have developed the newer and more advanced Speedpack 483 which uses a completely different ZeroSlip strap system. Not only does the 483 not have to be connected to your steerer tube, it can mount ANYwhere on your top tube, and it will have ZERO slipping or sliding. Maybe give that one a try?

Greg @ dsw

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Advanced Aero TopTube Storage for Road, Gravel, & Tri...ZeroSlip & Direct-mount, made in the USA.
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I currently have the same problem with the PD bag. Because of this, AND the bulging shape of the PD bag (its just a bag with no "walls") it rubs my right knee when come over the top if I keep them in tight.

Since you already have the bag, do you think it would be possible to relieve some of the wall material on the DSW where the bag and the cable interfere?

I've had mine for a long time so I don't know what model it is but yes.

What I did was trim the plastic liner that gives the pack it's shape. I marked it where the cable enters the frame and then cut it out to relieve the pressure pushing it sideways. It made the problem 90% better.

As Greg mentioned, maybe a newer model works better right out of the box.

So is the chainring the only 1x specific item you have? Have you had any problems with that setup?

The only way Obree could realize the narrow BB gains was by riding bikes without a top tube. Watch videos. Look how far inboard his knees are.

Any modern top tubed bike you'll hit the top tube with your knees trying.

I'm guessing the downtube and head tube on his bikes cut the air around his wildly inward legs with no top tube. Thus saving aero.

Just having a narrower BB won't really get it to the Obree level.

Video: Go to 6:47, you can't do that with a top tubed bike

https://www.youtube.com/watch?v=oJ9H0INZ2_s&t=715s

The WiFli RD is also designed for 1x applications. It will allow for a 36T rear cog, but currently I'm only running a 32T in back. 50x32T as my low gear has been fine living in the flatlands. If I still lived in Colorado, I'd probably go with the 36T.

I have dropped the chain exactly once. I think I shifted multiple gears while under load coming out of a corner.