Ok, I can try increasing the retraction a bit - I'll try 2mm - and I'll try 70mm/s retraction speed. I had measured exactly 100mm when I extruded 100mm, but let me run through that again to make sure something didn't change - if so, that could explain a lot. Oh, just thought of one thing I didn't try - tightening the tension on the filament - it doesn't really look like it's slipping to me, but knows.
Yep, I changed from the stock firmware to TH3D Unified Firmware. I have the same firmware on my bigger CR-10 and it works fine (that one is still bowden).
The gray bowl I printed before the titan-aero, and I used pretty much the same settings on the red prints (with titan aero), but I reduced the retraction that's all. Thanks.