The difference between the 207 boys entering avg and there championship avg was -4.42,
The difference between the 134 girls entering avg and there championship avg was 0.24,
This is provided I added it up correctly..Don't hold it to me though...
I'm using Black magic XL "extra length" and it's working well.
You could also try and increase your axis rotation for extra length.
This has improved my game a lot...
Do you know what this is and do you want to bowl in it?
http://www.totalbowling.com.au/forum/attachments/victorian-tournaments/9810d1304299861-2011-victorian-east-coast-roll-off-2011_utba_champs_entry_form.pdf