I just switched from stock Bridgestone Dueler tires (2006 LX470) to 275 70 18 Toyo Open Country AT3 with 1.25" Spidertrax spacers. I am experiencing a slight vibration in the steering wheel now, going 55-70mph, steering is just not quite as smooth as before. Tried rebalancing the front already. Just wondering, is this normal after going with bigger AT tires and spacers? What's your experience?