How about reducing basic salary so that it makes up only 60% of total income and substantially increasing trip pay to make up the other 40%? You're then rewarded for what you fly with unnecessary sickness disappearing overnight. Everything pensionable.
Introduce annual increments for CSS and FSM ranks of 2% a year
Allowances are not a part of salary but compensation for meals taken in the hotel. If the average price of lunch from the restaurant menu is only $15 then a lunch allowance at that hotel is only $15.