Here are the parameters from GWX3.0 FYI
Maximum Aircraft Range=2000 ;[>0] in kilometers
Poor Airbase Modifier=0.2 ;[>0] Modifier for poor airbase (carrier) rating
Novice Airbase Modifier=0.6 ;[>0] Modifier for novice airbase (carrier) rating
Competent Airbase Modifier=1.4 ;[>0] Modifier for competent airbase (carrier) rating
Veteran Airbase Modifier=2.4 ;[>0] Modifier for veteran airbase (carrier) rating
Elite Airbase Modifier=3.0 ;[>0] Modifier for elite airbase (carrier) rating
Night Modifier=0.2 ;[>0] Modifier on strike probability at night
Default Air Strike Probability=35 ;[>0] Default probability to send an airstrike from a airbase (carrier)
Enemy Air Strike Probability Increase on Radio Messages Sent=25 ;[>0] Increase over the default probability on a radio message sent
Friendly Air Strike Probability Increase on Contact Report Sent=50 ;[>0] Increase over the default probability on a contact message sent
Enemy Air Strike Probability Increase on Player Detection=40 ;[>0] Increase over the default probability on player detection
Atenuation Factor=10 ;[>0] decrease from an increased probability to default one on each air session
Logic Steps Between Air Sessions=20
Better still, why not give GWX3.0 a try