HK airport to shenzhen airport- tight for time

Hi I'm arriving into HK airport at 20.50 on Wednesday night and then flying out of SZ airport at 9am the next morning. How would you recommend getting there on time. I have not booked hotel yet as I can figure out am I best to go to SZ on Wednesday night or Thursday morning. Seems the ferries won't make it on time as there doesn't seem to be any running late enough on Wednesday or early enough on Thursday. Thanks for any help- would appreciate it!!