I've never used poly spool type engine mounts, but I've used poly spool trans mounts, and the vibration increased a lot. When I've used the earlier biscuit-type poly engine mounts, vibration also increased.
One way to get a little more support for the engine is to use RTV silicone to fill the voids in the rubber of the mount. Let it cure for a couple of days, and install as usual. It will take some flex out of the mount, but any NVH added would be minimal. I've done that on more modern engines with good results.