FWIW- if you are going to adjust toe make sure you do your test within a reasonable time frame!!!! VERY IMPORTANT!!! I'm a boating idiot but just saying- true test results need to be in controlled as much as you can conditions. Air temp, humidity, load on boat, water/waves, etc.

When I was squeaking every 10th out of my boat I would run a set of props, then try another set the next day and then back to the original set the next day and was unable to duplicate the 2 day prior results and so on. I thought I had the best set up in the world but then it ran like pooh the next day because it was humid and 10 degrees warmer.

I understand. I'm actually a test engineer by trade.

I'll check the drive toe on my 31ss this weekend. Where did you take the measurements from on the drives and was it effected by trim height?

Mine is set at about a 1/16 inch toe out \/, measurements taken at about 3" about prop shaft at the front and rear of lower casing.

That's how I have mine set, now. I measured at the center of the drive shafts and the center of the nose cones while in the neutral drive position(drives level with hull).