I am having a difficult time mapping inside corners with the trimmer attachment. The Yarbo either jams the trimmer against the wall while turning or leaves the area uncut and un-trimmed. Could you please make a video on how best to approach the mapping of inside corners when the trimmer attachment is installed.
Have you tried using a memory path in those areas? Basically you can record exactly what you want the core to do and have it play it back. You just add the memory path to your work plan and it will execute it along with any other areas you add.
As Bryan has suggested, have you tried using the Memory Path feature? It allows the trimmer to follow your exact steps, which can help handle tricky corners more effectively.