Carbonfibreboy, do you mean two 8 oz cups of Malto into a liter of water or two of those small caps ? Either way, have you found a good way to keep the clumping down when mixing? Or do you drink it like a lumpy slurry? I like Malto because it is cheap and goes into you quickly. I used to use only about 120-150 per hour and that worked for me but the mixing was a pain.
I tend to stay away from soft drinks during rides due to the acids. Maybe the sore mouth was like a canker sore.