You don't need 8 specialist in fact

The alchmist need only his book but stay 2* and provider camphor which is non specialist
(I don't know who want to try the new awful potion XD)

The BSM is mostly useless because ARM can do the same ingot and do armor (while bsm got alagan replica and fourniture)

So the main Crafter to have are GSM, CRP, WVR, LTW, ARM

Still didn't see the CUL book...
Don't know if it worth it or not