A couple things to note: HHQ-16s and HHQ-9s have complementary but obviously not identical roles, so the presence of the 052C/D and the 055 in the CBG would not necessarily mean that the 054A/+ could load less HHQ-16s. Naval commanders may also want the flexibility of not having to make the 054A return to base to take on more or less CY-5s (or whatever ASW missile) to change to a different mission. My personal guess is minimum 4, maximum 8 for a random 054A ASW missile loadout. The other thing to consider is that we don't know the range of PLAN's ASW missile(s). The USN has never really considered their VLA to be an offensive ASW weapon given its limited max range of 20ish km. If an enemy sub is suddenly located inside 20km range of your ship, you are already in trouble, and you are almost certainly the prey rather than the hunter in this scenario. A larger VL ASW missile, with something in the range of 55-65km, would be far more ideal to serve in an offensive role, especially as it could make it out to the first sonar convergence zone at that distance. If a PLAN ASW missile has a longer range, I would expect more of them to be carried due to their utility and potential to be used offensively. As for speed, most subsonic missiles (and airliners for example) fly at mach 0.8 to 0.85 because above that speed air resistance and thus drag increases exponentially until you break the sound barrier, which means going at (e.g.) mach 0.95 is a massive waste of fuel for little gain in speed and time to target compared to mach 0.85. OTOH a mach 0.85 missile takes 3.5 minutes to cover a 60km distance, by which time a sub especially moving at a fast speed may be able to escape the attack, as it could have traveled as far as 3.5km from the initial point of contact (at ~33knots), which would put it at the outer edge or past the outer edge of a torpedo's search range. For me an ideal VL ASW missile would be supersonic with a range of ~60km; this would be an impressive ASW weapon that could be used offensively.