Have you replaced the volute springs with the non-standard rubber bushes? I have no experience of these but I would expect to get more noise with those. Also I would try lowering the side mounts not raising them. If you think about it the rear engine mount needs to be set so that there is no up, down or side pressure on its mounting bolts,neither should it be forced against the any of the four sides of its carrier in the bulkhead.
Anonymous