it seems as if you did put too much oil and didnt get it all out. it has to be COMPLETELY dry to perform right. the powder soaks up moisture like crazy. as for the accuracy, its probably do to frustration and a number of other things, flinching,flinching from a delayed shot, too much oil, too dirty, etc. +plus what was the weather like? everytime you shoot the gun will soak up moisture from the air.
i would just take a breather, clean the gun, make sure it is dry, make sure it is dry again, and then go give it another try.
i would just take a breather, clean the gun, make sure it is dry, make sure it is dry again, and then go give it another try.