I am upgrading my power over the winter and am shooting for 10.0's. I currently run a MT ET Drag 28/10.5 on an 8" rim and run them at 11.5 lbs. I currently get a little movement on the big end at 125mph. I have always thought the movement was due to the lower pressure trying to get the tire to lay down. Will a 10" rim enable me to increase the tire pressure and possible become more stable or do I need to consider a different tire (i.e. stiffer sidewall/QTP/MT Street radial)or both?

I am in the debate of whether or not to mini-tub to get more tire under the car (75 Duster) but I am thinking I may be just as well off to do a stiffer sidewall tire on a 8" or 10" rim. The good thing with the radials is that you can get more tread width for the section width, the bad is that it adds nearly 12lb a tire.