Hi, I've never use PAL Cargo Services before but I can suggest you use our local
PHILPOST
Here's the link:
https://www.phlpost.gov.ph/rates.php
My mum recently sent me a parcel from Manila to Great Britain and it arrived in 10-12 days !!
I think up to 30 kilos will cost you 15,000 pesos ...bargain!!
I flew with PAL last April, they usually follow what is written on your E-ticket (if you are using one??)...Economy/checked in luggage 30 kilos...never had problem going in and out of the airport (no excess luggage charges)