I cannot fully agree with you. In fact, for profit, the Hong Kong local delivery is much higher than the China-Hong Kong delivery.
Hong Kong local delivery get at least $15 for 1Kg and $2 for subsequent (or $7-8 + $1 per one way), the delivery of China-Hong Kong for no matter 公司客/淘宝客 only get $5-6 for 1KG and $0.5 for subsequent Kg.
For China-Hong Kong delivery, majority of profit have been earned by 何生 or other agent.
Therefore, it is very hard for us to influence the Hong Kong delivery company, unless you have large amount of Hong Kong-Hong Kong delivery.