Brill, thanks for your efforts Si !
I wouldn't say you did anything wrong - very useful data.
I've reformatted a bit to make it easier to read :
String 1 (4.51) String 2 (4.51) String 3 (4.51 sized to 4.52) String 4 (4.52 sized to 4.52) String 5 (4.51) String 6 (4.52 Lubed) String 7 (4.51 Lubed) String 8 (4.52)
What I'm looking for is a combination of both the highest average fps and the smallest deviation. So from those results I'd say that your best groups should have been with string 8 and 5. Worst group should have been string 7.
Can't explain why a difference of 40fps downrange still managed to hit the same spot at the moment - I can play around with some figures in a ballistic calculator to see how much difference that should make, but when you're talking about groups - there's always the chance of human error and lift from wind I suppose
I wouldn't say that any string really stands out to me as being mega (like my die 19 string). String 7 stands out as being the worst.
When you say some of the groups suffered from a bit of wind drift, was string 7 one of the ones that suffered from wind drift?
Oh and string 4 (the sized pellets) don't seem to stand out as being any better, string 3 (also sized) seems to be worse than almost all the other strings - perhaps sizing from 4.51 to 4.52 isn't such a good idea?