Tire Marking problems of the 2005 Toyota RAV4

I purchased a 2005 Rav4 2 wheel drive, 5 speed, in December 2005. The exact date, I am not sure of in that the issue is ongoing. I first noticed the oe (toyo tranpath a14 215/70r16 99s m-s) tires by toyo were loosing traction when going around corners, I attributed that to the new auto and was more careful until I got used to it. I was coming home one day and proceeded onto a freeway onramp. The roads were wet but not excessive. I made the turn onto the ramp shifted and the accelerated, I found at that time the tires were loosing traction, so I backed off the accelerator. I am also finding on ribbed freeways that the car will not track. I recently wnet to the dealer and explained what was happening. From here it is an ongoing process of dealer telling me talk to Toyota and Toyota saying talk to toyo. During my numerous conversations with toyo, I was told that the tires were graded 300 bb. I asked if this was problem, "I don't know" my last conversation with toyo I asked if the tire is bb why does my tire say aa. Thye needed to research and not to my amazement they told me that the tire was an aa and they just found out. They further stated the tire used to be bb but in 2001 was upgraded to aa. "miscommunication from toyo japan to them. How many people have to be injured etc.