rim width

I`m going to buy wider rear rims for my 295 60 d15 hoosier quicktimes. I am running them on 8" prostars . The maximum recommended width for them is 10" , minumim 8" . They are working fine , but since I`ve decided not to tub my fish , which would be the best for street n strip , 9" or 10'' rims . Trying to maximize what I`ve got , "traction is limited"thumbnail.jpg . Don't really want to screw them down , but will if nessecary. They have 10'' tread ---------------------------------------
What say u guys ??