You've mentioned - "....airline industry for 10 years in Singapore and am only drawing an approximate salary of S$1800......"

Exclude or include CPF?

I think, asking for basic - 11k  from 7.5k - is way too high.

Forgoing housing allowance doesn't mean you'll be staying at co. accomodation.

Probably you'll get somewhere close to TOTAL of: 10600(your original offer) - 11,300K

*Fingers crossed*, wish you all the luck.