Do radial slicks hook better in the heat than bias?

My AMX is faster and more consistent with radial slicks. My first set were M/T PBR 14x32. I now have Phoenix 14.5x32 radial slicks. I love them both. I can't tell much difference between the two. I got the Phoenix really cheap and I wanted white letter tires. The M/t 14x32 PBR's are not available in white letter. But there is no doubt on my car radial slicks are quicker and faster than bias ply.