X12 motor timing explained??

[c0sie]

My X12 6.5 comes with timing insert number '4', which is X-10'

Firstly, as a total timing n00b, is -10' a higher timing than the +10' that is given when using insert number '-' ??

Also, the printed instructions that came with the motor shows timing number '2' as the standard insert whereas the LRP online manual states that number '4' is standard. Any ideas which is correct?

Thanks