Well the Eclipse STB connects to the firewall in the 3G Eclipse. The Galant being slightly longer doesn't allow for the bar to be bolted to the firewall.
The GTZ springs and GR2 struts should ride just fine. The GR2s are a factory replacement. My guess is that there is another issues, either the tire air pressure is way to high (or low) or the tires are really low on tread (not that the RSAs ride that well anyways). Recheck all the bolts and ensure everything is tight and kosher with the suspension.
Then redrive the car and see what is going on.
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