"And what would be the point of all this experimentation, if he already knows the outcome?"

Simple: A fortified illusion. God wouldn't want you to believe that there isn't an epitome of evil and sins for you to not abide by. He would want to substantiate his illusion of free will through creating a logical background for his believers.

The illusion God would want to keep up is a very subtle one. Say he were real, that doesn't mean he would want us to know for sure. The best quote I can pull off the top of my head is "(referring about God's work) When you do things right, people won't be sure if you did anything at all". The things being done right being the things God does. This is because by not giving absolute proof of his existence, people's faith and ability to believe and not question God's eternal love and plans for us proves whether or not they are worthy of heaven.

Now the question that's probably provoke in people's heads right now is: Why would he do this if God's plan for you is predetermined anyways? The answer is simple: God is all knowing, and God knows that by doing such, he creates the strongest illusion known to mankind. His plot for appearing that free will is an ability which we possess, his fake repercussion for the actions he says others make for themselves, all lead up to an intricate plan which we have yet to find an error in.

Again, the ideas I stated which you quoted the second time about "that God" isn't perfect, and there are still problems, but I think that it's advantage is unmatched by many other conceptions of this omnipotent, omniscient, spirit.