You're right that you get extra points for correctly predicting the winning margin but its set at 5pts regardless of the margin of victory. Its a great idea for next year and would really shake it up a bit. Just a little late for this season as i'd have to go back through the results and ammend previous weeks.
Just to confirm how you got your points, please see below...
Quote ="pulsator2k7"Leigh v Leeds - Leeds by 36 [i1pt for correct side winning[/i
Wigan v St Helens - Wigan by 14 [i1pt for correct side winning plus 5pts for correct margin[/i
Catalan Dragons v Warrington - Warrington by 8 [i1pt for correct side winning[/i
Huddersfield v London Broncos - Huddersfield by 14 [i1pt for correct side winning[/i
Batley v Featherstone - Fev by 22 [i1pt for correct side winning[/i
London Skolars v South Wales - South Wales by 8 [i0pts due to match called off[/i
Cronulla v Melbourne - Melbourne by 14 [i0pts for picking wrong side to win[/i
Penrith v St George Illawarra - St George by 18 [i0pts for picking wrong side to win[/i
Tie Breaker - 386'"
Hope this has cleared it up