Rear tire width requirements in relation to HP?

I'm running 205's on the back and they don't grip for nothing. Doesn't help they are old winter tires that were thrown on the car when I bought it. If I mat it, it'll just burn the tires through 1st, 2nd, and into 3rd before it really picks up. I can easily light them through the entire intersection if I want. Kinda makes it fun but also difficult to show up all the modern muscle. Burnouts for distance are easy, throw it in first and pin it and I've done block long burnouts. It's fun, but traction would be nice. It's getting new rims/rubber this spring. Going 245, maybe 255 if I use the offset shackles. Still haven't decided on tires. I like radial t/a but I'm still keeping my options open.