Alright how about this.

Above ALV you get 2x pay. BUT, you are limited to 100 hours of credit excluding GSs. So it's 2x pay AND a cap.

So, 85 hour ALV, say you're line from PBS went to 90 hours. You'd get paid 85 hours + you get 5 hours x 2, so you're paid 95 hours.

But now, you're capped because you can't pick up anything less than 5 hours which times two would put you over 100. But don't cry. If everyone gets capped, then there will be more in the pot for GS flying.

If the ALV was 72 hours, fly an extra 2-day, get paid 93 hours. Now put in for GSs.

And let's make GSs really fair, instead of restarting the block every month, use a 3 month running window.