Sorry to hear that you're disappointed with Pro. You mention upgrading from X to Pro but the Pro license in your account has been purchased outright and there are no other licenses in there. Therefore I cannot revert the Pro license to X, nor add an X license since X is sold exclusively at the ThemeForest marketplace.
However, if you go ahead and purchase X then register the license under this account, I'll then cancel the Pro license and refund it in full. Please drop me a note here once you've done that.
Thanks for trying Pro!