There’s no difference between advanced and SL other than half a water bottle in weight. Ride my Propel Advanced. Then ride my Propel Advanced SL with the same wheels. You won’t spot the difference. They have the same contact points, bars saddle and pedals, same stem, same set up. Worse than that, there is hardly any difference between the alloy Defy I put together from old bits, and the super duper lightweight 7 kilo dead Defy SL that cost 10x more!
And yes it was John Degenkolb. After big Sep VM, always the nearly man, was runner up a few years earlier. Sadly you can’t buy that winning frame anymore because Deg won it on the previous year’s non disk version, just after they’d replaced it with the newer D-fuse seat tube disk model. I’ll never sell mine.
Geez why would you size down and then run a shorter stem? A longer stem yes, but why shorter. For a winter, I rode a Small alloy Defy with a 130 mm slammed stem, just to see if I could. Low front end and again almost replicated my race position, a 140 would have been better, but too expensive for a hack bike. Degenkolb races on a 120 mm -17 degree stem. Finding the overdrive 1.25” versions in the right length can be both frustrating and expensive.
Do you have spacers on your normal set up on a. On-Defy?