Is it beneficial after doing a subconscious channeling session, to request a Soul Matrix Healing on all issues discussed?

This is highly beneficial and will be the best way to achieve the maximum benefit from all that took place. Again this is a good example of the specificity of a request determining the extent of the outcome, and this is the power of the Lightworker Healing Protocol to include many such specific requests, and their intended consequences, in a direct outreach to the divine realm. So this will add a significant additional benefit to the one-on-one healing of the process itself, as well as the Belief Replacement work, if done.