Barrie,
I agree with you. I have a 10 lug Gon Bops and a 10 lug Ismael. I just had Cali (JCR) make standard 8 lug hardware for the Ismael. I now love it even more, before it was too heavy, unconfortable on the knees and the crowns were too high, which made it a killer on the fingertips. Right now is perfect.
The 10 lug bongo' was a creation of Rogelio Iglesias (Yeyito), who played with Cachao on the Descargas and with Conj. Casino. What it provides is a very even tunning and Yeyito liked a very crisp sound on the macho. It became hip and avant garde to own a 10 lug bongo', but it is definitely unconfortable and heavy to play 3 sets with such an instrument. My 2 cents.
Dario

Attached:
My 10 lug Gon bops and 10 Lug Ismael