Joel;
Carefully check all of the engine mount bolts/nuts and the cylinder head steady to make sure they are fully tight.
I rode my G5 for I don't know how many miles thinking, "Yup. It's a big single and it's supposed to vibrate." Then one day I looked at the lower rear engine mount nut and it didn't look right.
It seemed to have a gap between it and the frame.
Putting a wrench on it, it turned without any resistance at all!
Looking deeper into it, it turns out that the bolt had broken inside the hole so although the end was still in the right place, it was providing no support at all.
Anyway, after replacing the broken bolt with a high strength heat treated thru bolt and high strength nuts and torquing it to the service manual specs almost all of the vibration vanished.
I can truly say my G5 vibrates less than any motorcycle I've ever owned except for my BMW K-75 with its outstanding counterbalancer.