rod question

[hookset]

I recently acquired a beautiful Calstar E-glass custom rod I think it was rated 20-30lb. The rod has amazing sensitivity and decent backbone with bend all the way through rod.
Question is at 6'6" does the board feel this is to small for blackfish?? I have only used rods 7'6" before and over past couple weeks notice as a whole longer rods are used for Tog.
Further more what is the advantage to longer rod vs shorter rod as long as sensitivity and backbone are present?
Only thing that i can think of that will affect me using mono on a short rod is the shorter swing maybe lead to rolling to few more fish as the hook doesn't get lodged into their mouth.

I am sure that if i used it i could become comfortable with it like anything but really just looking for pro vs con of longer rod vs shorter... thanks guys