The only further suggestion I can offer is the introduction of an ATC allowence. ie. if you are in a traffic separating position, you get an allowence of say, $50k per year. Then they could have a 'salary' component of say, $130k per year plus the allowence for those who actually have sep responsibilities. That way, managers can earn more than their underlings, say $140k per year, and everyone would be happy.
Govt happy- can announce salary reductions across the organisation
Controllers happy- more money at the end of the day
Managers happy- their salary is higher than their subordinates, and they wont feel guilty about collecting huge salaries when their actual responsibilities dont' warrant it (not separating traffic, not working shiftwork etc. Basically at the level of a call centre team leader- except paid more for some reason).