So there’s a few things I’m seeing here, that might just not be the best piece of maple as its chipping out really bad, so in regards to the male piece of inlay I suspect too deep of passes when carving or dull bit.
A 60 Degree bit is absolutely fine depending on the settings you are using. I have gotten my finest details from a 60 bit as it allows to carve closer to the surface with a much larger base below for stability. I suggest you watch this video and pay careful attention to the “Zones” portion.
To also further the topic, I used a 60 degree in an experiment that further goes into the depth of passes when dealing with hardwood and V-Carv Inlays specifically for Wenge but the i utilize the zones as well you can see at the bottom of this thread Duplicating V-Carve toolpath