Ok. If God were telling you what your will is, then this would be valid. But the test is to see if God can tell you how your palms will be, not what your will is.
However if God allows you to act freely, then your will directs the placement of your palms. Your action is the outward sign of your will. Are you saying you 'willed' to put them 'down' and found them to be 'up'?
If you will to have your palms the opposite of whatever God says, even if God knows that, then even God could not say, correctly, how your palms will be. It's so simple even a grammar school student could understand.
Apparently it's not that simple. God could not tell you how your palms would be in this scenario because it would result in the opposite happening. However, God might know and tell others of the result; and, your actions would verify His knowledge.
Let's say God knows that your will is to do the opposite of what He says to do.
God decreed before creation that you would put your palms 'up'.
How might God effectively carry out His decree?
I see two possibilities:
1. God foreknows you will put your palms up so God allows you to do so(through providing you hands, a will, and the environment in which to commit the action. Also He does not intervene to stop you.).
2. God foreknows you will put your palms down so He must intervene to accomplish His decree. He intervenes by saying you should put your palms 'down' which results in you putting your palms 'up'.
Is God culpable for either action? Did God make you place your palms 'up' or 'down' in either instance or did you act freely?
Did God 'trick' you into putting them 'up' or was it your will to do the opposite of what He said to do?
"Nineveh, Nineveh, Where for art thou, Nineveh?"