You are .03 seconds slower...that's 3 one-hundredths of a second...you can't blink that fast. What's happening is the 295's have so much more traction than the 235's cause they have more rubber on the ground. Your having a much better 60' and normally the better 60' you have the slower the mph. Did you spin the tires out the hole with the 235's cause that is usually what makes your mph faster but E.T. slower?