I have been playing with all the iterations of the Dunlop 300, everytime in regular version (not the tour). They all play great... with lead at 3&9 to increase the stability and in the handle to keep a balance at 32.5 cm. I did not really enjoy the AG, preferring a lot the old 300G but it has good power (with multi), great control and plow through. On my sliced one hand bach hand, it just feels wonderful. The 4D is excellent stick but a bit more beam box that the previous ones and it feels a bit stiffer. IMO, the Bio300 is far better, reminds me the old 300G. I am more a flat hitter that someone looking for spin.
By the way guys, how would you increase the sweetspot on the 300s? Is lowering the cross tension would work well?