You spend a lot of time quibbling over meaning which is clear to everyone else, and you spend no time actually discussing the issue.
I have tried to broach this to Mikkel a few times, and will again presently, but he has previously declined to discuss it.
You haven't solved the epistemological problem in solipsism and the problem of the-thing-in-itself. How you know something independent of your mind, if you only know through your mind?
I think you have things turned around. What is of primary interest is what's going on in ones head, not what's out there contributing to the experience - that is, subjective truth, or how things will appear to us from our various subjective vantage points.
Consider the chair in my living room. I experience it subjectively from 360 degrees, each view being different. I can use the device of a chair being out there prior to my experience of it as a mental model that will allow me to predict the experience of that chair. It really doesn't matter what that thing out there is or if there is anything at all. If you found out that there was no external reality corresponding to one's apparent experience of it, what would change? What would you do differently. If the rules of your radically solipsistic reality remain unchanged, then you will successfully predict and even control future experience.
science is based on beliefs, that you can't test
Disagree. The stellar success of science tells you that the principles upon which it is founded are valid. People keep forgetting that. The "truth" of an idea isn't something out there beyond experience such as so-called objective or absolute truth. A better way to view knowledge is that collection of ideas that work, are useful, and allow us to control experience. You say you want to send a probe to Pluto? You have a set of ideas about launching and controlling spacecraft, about celestial mechanics, about when and where the two should meet.
Are these untested ideas? Not once photos of Pluto begin arriving at earth. Success is what defines the science and all of the principles underlying it as useful. That's a s close to truth as we can get, and it is close enough.
But your response is typically that knowledge isn't possible because we can't get outside of experience to experience reality before consciousness renders it in the theater of consciousness. I've argued that that is irrelevant, and excessive concern about this undermines one's ability to make progress in one's own understanding. It feels like you won't walk because the ground you see before you might not be what it appears to be in its fundamental essence. These ideas don't help you. The opposite is the case.
What benefit has this program of radical skepticism and nihilism been to you that you cling to it so tenaciously? How does it inform your life for the better? Has it helped you to make better decisions or avoid worse ones to manage your conscious experience as all good ideas do? Has it made the mental map you use to navigate experience more useful in controlling outcomes for you? As I said, I suspect it has done the opposite - kept your map less complete and your fund of useful knowledge less robust.
Was it you that equated skepticism with permanently doubting everything? Whoever did that, I disagree. The doubting in skepticism refers to questioning man's ideas, not reality. We consult reality to see if man's ideas can accurately predict experience. If they can, they're keepers and we add them to a growing and dynamic fund of knowledge comprising or mental map of reality. If there is insufficient empiric support for the ideas - they fail to be useful - we reject them. And then the doubting on that issue is complete.
As you alluded with your reference to the limits of knowledge, yes, in this process we never eliminate philosophical doubt. I agree with you and Descartes that our experience might not be of that which it appears to be, but this doesn't actually affect further thinking and decision making.
Anyway, these ideas are offered constructively. It is my hope that they will modify your philosophy and behaviors of thought for the better.