I can say your understanding of the philosophy of egoism to the consideration of the way in which we experience the ego. Even though I have sympathy with Hinduism and Buddhism, I do believe one of the problems of Eastern philosophy, as well as Western forms of religion, is that the ego is underplayed. This is especially true when people think that they are overcome the needs, including the instincts.
Even though I do meditate, using a mixture of methods, including some mindfulness techniques, I do not believe that it's helpful to think in terms of overcoming the ego. I do believe that many people think that they can switch off the ego, but I would say that they are probably deluding themselves.
I would also say that it is at the level of the ego that we experience the way in which mind and body are interconnected in an intricate way. The perspective of ego is one which cannot split the two apart. The physical needs are combined with goals and aspects of social and cultural ones.
It does all come down to perspective and in this respect I bring in the ideas of Nietzsche, who has influenced the development of your own ideas on egoism. During the weekend, I was reading a book called 'Knowledge From a Human Point of View' , by Ana-Maria Cretu, which has a chapter , 'Nietzsche's Epistemic Perspectivism', by Stephen D. Hales. In this, the author includes Nietzsche's emphasis on the role of instincts and pleasure. Also, he describes how Kant and Plato can be seen as placing an emphasis on 'otherworldliness' and,
'Instead of absolute truths and partially objective knowledge of a supra-empirical world, Nietzsche offers a vision of partial, fragmentary, perspectival knowledge.'
I think that this reminds us of our limited human view. Personally, I'm inclined to think that there are higher states of consciousness which we can access, but at the same time do believe that the perspective of realising and affirming the needs of the ego is essential too. I see this as being an important aspect of self awareness.