the symptoms you have are generally wishbone symptoms, pulling one way under acceleration and the other when braking/turning = wishbones normally, are they defo new wishbones? and id strongly advise genuine ford parts as aftermarket parts will have had it in no time, if the engine rocks about excessively then its normally the rear mount that has had it but could also be one of the others, if its not any of them causing the vibration/pulling then i havent clue what it is, hope this helps