You should probably get an alignment like Andrew said. As far as the rear tie, I don't think that should make a difference. I don't have it. I'm surprised you don't notice everything working in conjunction by now. Although I'm on coilovers, I drive it very aggressively on some curves and exit ramps, tires screeching and all and I feel very planted and confident. All I have are the strut bar and rear lateral only. But I'm pretty slammed, so that could make a difference too, compared to H&Rs. Plus your springs could take a few more weeks to settle in too. Are you running stock 20"s setup? With or without spacers?