Probably the cost? Dunno much. Kiri is really good as a middle core and i like it better than ayous.
Is both Kiri and Ayous regarded as mid speed or slower woods?
First of all good job making those blades. They look pretty good. In terms of getting clean edges usually an quality router bit helps. I used sandpaper to finish of the edges to get a clean look.
What Robert is saying is probably the cheapest way to do it.
I find diamond sharpening stones the best for sharpening router cutters. Something like 400 and 1000 grit or they are often sold as coarse and fine. You can pick up a decent set for around 40 euros, you'll get sharp cutters and the stones will last a very long time. If you want them really sharp hone with polishing compound and a strop.
I've done that with good results. However, in the case of template bits there's a limit. You can't sharpen them very much with risk of reducing the original diameter, relative to the bearing. Also, sharpening one side more than the other may cause imbalance in the bits.
great work hipnotic! Very professional looking. Some interesting combinations, it will be good to know how they play.