To both go fast AND be able to pull tight turns you are best off looking for an airfoil with some low amount of positive camber. When you look at the Cl vs Cd chart look for airfoils that have the more vertical portion of their lift where the drag changes but little centered at around the Cl=0.3 region of the vertical axis. You want an airfoil which extends this more vertical portion down to the Cl=0 like and up as high as possible but which still gives you a good thin airfoil to work with.

I'm not familiar with the airfoil used on the original model. But it's highly likely that you can put the new wing onto the fuselage at the same angle as the old. Then play with the CG location to achieve as small an amount of pitch stability as you can manage. Doing so will aid in allowing the model to turn as best as possible.

A degree of washout would likely not hurt either. But if you use too much washout then the tips will be flying at a negative angle of attack at high speeds and produce more drag than you want. But around -1.0 to -1.5 degrees of washout SHOULD aid in avoiding tip stalls in high G turns.