I agree with putting drivers in there own ability brachet as the other week at the York regional I was put in a very high heat which I didnt like, I was more bothered about getting in the way of the faster lads than concentrating on my own race so I did pants. If I was in a heat with drivers of my own ability I would be alot more relaxed and drive better. If it is done right you can let faster drivers through without losing time, you dont need to stop to let them through or slow down to much I will tell the faster driver which corner to take me and I pull offline just a little to let them through (then push to keep up with them and crash). If they are true talented drivers they will know how to take you properly.