Good questions! Many athletes find that their power drops in aero position. Others find it goes up. Some of this is fit, some of it is practice and some of it is engaging your core! There are many variables that can cause this. However the most important variable is continued practice. So while you don’t need to spend all of the time in aero, the more you practice (especially outdoors) in aero while engaging your core, it can help build up your power output.
Do others have a similar experience? Any other tips or ideas? Nice work Sebastiaan for getting in aero position practice. It definitely takes time to regain your power and muscle strength (particularly in your neck)!