You are correct that you can send 10 000 HKD per day with FPS with any type of identifier. But I have not found a way to send more than 10 000 HKD per day. Given that both my rent and the amounts I transfer between accounts is much larger than 10k its not really a viable option to spend 4-5 consecutive days to send my money over in batches.
Pretty funny, thanks to your post I logged in now and tried it out. Omitting my middle name, and lo and behold, it works, wow thank you! I have confirmed with multiple bank contacts that nothing can be done in regards to this. Both over email, a email in the form of a offical complaint, which by HKMA regulations gets a special attention and answer, as well in the branch office, but two people. In just shows level of competence and service you get when its Geoexpat that comes to the rescue!
Edit tried to pay the landlord as well: Nope sorry the landlord payment still bounces. The name is something like Lucky Happy Trading Company LTD. I don't know how to truncate that for SCB FPS system to accept the payment. Now I can at least send money from SCB to HSBC and from HSBC pay my landlord.. ..oh the quality of HK banks!