So I ordered the TOP spool that was mentioned previously. I'll take pics ASAP.
The stock aluminum TC5 Spool is between 6-7 grams and the TOP steel spool is 11-12 grams. The unit does not use blades but does center the pulley perfectly, whereas its trial and error on the AE spool. The outdrives are quite a bit longer, so I may machine it down to be almost as short as possible to save weight.
For those curious, it is part # PO-ADT002. Top also makes an aluminum center pulley assembly, but I did not order one. My stock one has been fine for over a year...