We swapped from M/T 3062 (bias) to a 3062R (Pro Drag Radial). After trying everything we could to stop hitting the tyre hard, we decided to make the switch and carry on with where we left off on the chassis settings. On the first "full on" pass the car did a huge wheelstand, I panicked, it came down hard and damaged a lot of stuff. We have calmed it down some but the car has to wheelstand to run the best ET's and MPH (Caltracs). Best 60ft is 1.39 on the back wheels and 1.32 just breaking the 60ft beam with the fronts. The car ET'd .07 quicker on the 1.39 rear wheel 60ft. (9.51 v's 9.58) BTW.
If you are running good with the bias ply's you will likely have to alter the suspension settings to get the best from them, most hit them fairly hard and they need to dead hook by all accounts. We also experimented with tyre pressure and ran them as high as 20psi but we started to spin around that pressure, we usually run them at 18.
If I can help it, I won't go back to a bias ply, the car runs straight with no handling issues. We recently got some beadlock rims too as after around 25 passes, the tyre had moved on the rim 180 degrees.
Below is a typical pass
HTH's
https://www.youtube.com/watch?v=0a30GFuwrGU