For the summer, CX is extremely TIGHT about releasing "A" class seats. They feel that with their new reputation of having the best first class product around, they can afford to see full fare "F" class.
I have a similar flight myself and I'm still on waitlist for travel in late August.
However, priorities on oneworld - emerald etc seem to do little to budge CX's decisions.
The highest priority is CX's Diamond. CX's Gold members have the SAME priority as other OneWorld Emerald members, and if a seat comes through, it usually goes to CX's customer first.
There really isn't anything anyone can do - other than just sit out and wait. Usually CX starts releasing their inventory a week prior to departure. But then, as in the case of their LAX flights, they do not need to sell "A" class seats when their "F" class are being snapped up just as fast!