Do you think the drop is in the solenoid itself? or on the solenoid connections.. since he as 12V at the + post on the solenoid, and 9V coming out?
It appears that was the case. I put a new solenoid on and it seems to have fixed it. Starts right up. The only thing I was unsure of is my original solenoid has the battery/starter posts vertical and my replacement has them horizontal. So I wasn't sure exactly which post to connect the battery and which to connect the starter, it may not matter since its basically just completing the connection between posts.
Thanks for all your help, maybe this will help someone else down the road.