Hmmm, do you pay tax on the sector pay? If not, then that's illegal and of course it should be included in the contract - ommiting it is also illegal and of course could result in a situation where they turn round and say "sorry, lads, no sector pay from now on" - and without documentary confirmation you haven't got a leg to stand on.
I understand that the FR definition of 'qualified on type' is
not B737, but rather B737NG. How many hours on that do you have,
Mermose - and does it comply with FR's stated minimums? If not, there you have your reason why you've been given this contract...