I don't think you can be stage ready in that amount of time, even for a natural competition. Just being honest. Maybe a year from next November. Your rate of muscular gains over the past 2 years just doesn't indicate to me that you'll get there in that amount of time. Gains will be tougher over the next year than they were for the first 2.
As for your back, it's all about rows and pull ups. I mostly stick to pull ups. My lower back has benefited greatly from heavy deadlifts as well.