Speedmaster Improving Front Brake Performance?

Don't forget brakes are not just about surface area. If the area goes up then surely the clamping force goes down for a fixed pressure; is your hydraulic system adequate to provide greater leverage than currently used for the stock pads?
Lots of factors come into this one like master cylinder bore size and mechanical advantage of the pivot point etc.

If I was you I'd look at alternative pad materials in the stock pad size and shape, then decide what fits your criteria and purchase accordingly.

 

With twin front discs I find them more than adequate.
I do agree with Eldon on looking at pad material (sinted organic or ceramic) and I have upgraded the rear to Brembo 4pot calipers.