Your vision board will have no adverse effect on your sub results. If anything, it will help guide you subconscious to manifest exactly what you want ie what you put on the vision board. Vision boards are nothing more than a form of visualization. I personally don’t use them but I use affirmations, regular visualization, scripting and journaling. You can use whatever tools you feel can keep you focused on your intention.
Just stay away from things like binaural beats and brainwave entrainment which have a direct effect on your brain and we don’t know yet if that can interfere with Sub Club products.