Hi Joy,
Pardon to jump in. Mrs Fitri is our Air freight manager, and we respect her judgment to determine which port to be utilized. If cargo is oversized/overlength and cannot be catered by A330/B777 that usually lands in SUB, using JKT/CGK Airport is possible by using some freighters.
However, if we look at delivery address (Gresik), it is very much nearer to SUB airport. Approx 40 kms, and connected by 1 toll road. Means, if you wish to send to SUB, it is workable.
Our Luky have sent you the SUB charges in previous email.