To me double salary is the point where you have earned double your basic salary, so for the A320 the MGT is 73 hours, double that is 146 hours credit time, as overtime kicks in at MGT plus 20 and the rate is 1.5:1, that means you only have to achieve 128 credit hours to get paid double salary, not 90 hours as you have stated. For your information, only 1 Captain achieved that in the month of October.
As for the B777, the magic number to reach double salary is 138 credit hours. No Captain reached that number during the month of October.
Even allowing for the additional productivity based on 100 block hours, no new hire earning the amount that you are stating!
Seniority applies to everyone, you will notice that you get a 3% pay increment next Wednesday. So all of your salary, overtime, flight time benefits are increased.
So please, if your intention is to encourage or discourage people from joining SVA, please quote realistic facts, this will allow them to make an informed decision.
Mutt