Proof Mind is Fundamental and Matter Doesn't Exist

[Rational AKD]

Only if you subscribe to this Cartesian view. 

do you consider the view incoherent? or do you not subscribe to it because you don't personally favor it? in which case you're basing an objection of a personal preference rather than sound reason.

We can be certain we are conscious, and we can be certain that we are conscious of something.  This means there is an external reality.

I would agree that is true, but it is not necessarily true. by what we experience, I would say there is an external reality. however, I believe this external reality is a simulation created by another mind. this other mind contains all reality and has nothing external to it, but when it comes to our minds there are things external to them.

Introspection is useful but it is demonstrabley not the optimal way of uncovering truths. What truths have been uncovered through Introspection?

besides the proof of self existence René Descartes came up with when he founded epistemology?

Truth requires extrospection and perception through our senses.

I don't often agree with David Hume, but one thing I did agree with is anything a posteriori (gather through the senses) only tells you what's possible but not necessarily what's true. anything a priori (such as things tautologically known) are known to be true.

To hold solipsism and idealism as a real possibility is to deny the very things you need to affirm idealism and solipsism.  A blind man cannot form the concept of colour, someone who promotes idealism cuts off their own head, in order to state "look I have no head".

I somewhat agree... however in my idealistic view i would say concepts are introduced to us by experiences formed by a mind external to my own mind. thus this problem doesn't occur in my view.