Hi Peter,
What radio are you using, if it is Spektrum or JR you need positive + expo. to calm things down. I found the model to be very disappointing and slugish. On the tail I have moved the pushrods to the outermost arms on the sevo and the innermost on the control horns. On the ailerons the slot that the pushrod comes through the wing restricts the movement and needs to be opened up, also you need to fit the same length servo arm as supplied for the rudder and elevator to the aileron servos, I am in the process of doing this. I think the ESC is very poor and seemed to give a stepped rather than smooth output, so that is being replaced also. I had the same sort of problems with my Wot-4 E, you only get what you pay for so dont expect perfection at these prices.
Alan