At 50 years of age 60% of people have disc bulges. Most people that have a disc bulge at 50 don't feel any pain and are unaware they have a bulging disc. It is like saying to a 49 year old you have gray hair, wrinkles and you wear glasses. It is a normal result of aging. I would not worry as you are doing the best exercises that I know of for your back. So keep following these programs.
With the bench pike just do them as in the video. No need to make them more complicated.