1/2 total, 1/4 each side worked best, we tried it all different ways. the guy who set it up was Mitch Evans, he the hydro driver.

ask jeff at hawkeye...he had a big toe number,,,cant remember ,,,also is the measurement from drive to drive,,,or what boss302 said each side?????

How would you measure each drive measuring them individually? There is no way to do that. Assuming the engine center lines are mounted exactly 36" apart they would have to be exactly centered in the hull also to get a "correct" measurement via your (Mitch Evans') method.

The correct way to measure toe is with the drives pointed straight & in a neutral trim setting.
Measure between the front center line of the drive & the rear dimple on the propshaft. If the rear measurement is larger than the front measurement you have a toe in condition & if the rear measures less than the front you are toe out, equal measurements are neutral.
If you are measuring any other way you are doing it wrong.

At 1/2" toe in or out you're either plowing water(toe in) or dragging water (toe out). Either way you're going slower. There is also the possibility that since Seattle is so close to Canada you may be using a metric ruler instead of an SAE ruler.

I'm not sure how he came up with the math, but jason having a PHD in boating is sure to know and since boating is such an exact science i'm sure all his # are right.

I don't have a PHD in anything, but I did answer your question to the best of my ability.