Your milage is pretty impressive. I have only been able to get around 8500 out of OE Stones and around 10k out of the E4s. My traction experience was also the same. I could break them loose while pulling out onto a road and twisting the throttle too hard and wet roads were even worse. They would also chase a tar snake off of the road if you weren't careful. I went back to the Stones a few weeks back and will likely stay with them going forward.