Sirius,
if I didn't lose track while counting, you are still missing the Hasselblad 60mm, 100mm, 120mm, 180mm
Plus probably a few others which could be considered redundant given what you already have, such as 40mm or 160CB. Or yet others such as the 30mm fisheye, 135mm macro, or 250 SA. Those might probably be less useful, which does not make them less amazing. (I don't use my 135 that often but I think it runs circles around the 120, which in turn wins in general usability)
As I always say, no matter what, you'll own them all eventually.
As for the film backs, this is probably the weak link in the Hasselblad system. You cannot have enough. They are in limited supply and their value go up fastest (in particular the newer-style backs with dark slide holder). I am tempted stopping using my best-looking backs and considering them as investments. Better value than what you'll get from any savings account. (Well, I shouldn't say that publicly and keep my trade secrets for myself ha ha
)
Congratulations on your 10th and for owning such great cameras - I am sure you are putting them to good use. Way beyond what the Tamron 28-300 would have given you in any case.