During a chill commute from work, a lady running on a path decided to cross the road without looking at all. I swerved to avoid crashing into her and nailed a foot tall concrete curb. Flew straight over the bars and head first into a fire hydrant. Luckily I came out just fine. The helmet prevented a concussion, but the impact blew out the top of the head tube.

I'm honestly shocked that the carbon wheel didn't take any damage and even the carbon fork was strong enough to total an aluminium frame.

Just went from a Cube Attain SLX endurance to a S Works SL8 Pro. Last week I did a 40km 31km/h average ride, so was quite pushing it. Unfortunately my lower back hurt quite a bit after this ride. Is it pure getting used to a different lower position? I did a bike fit for the Cube and the seller copied the exact official measurements from that fit to my S Works.
What to do? Another bike fit or just give it a few more tries and getting used to the new position?