Vulkans are an advanced weapon, and although the airframe is evolved from the old 1960s P-5/P-35 "Shaddock", they are entirely a different beast. A Bazalt/Vulkan salvo functions as a wolf-pack:
The missiles were intended to be used in salvos; a submarine could launch eight in rapid succession, maintaining control of each through a separate datalink. In flight the group could co-ordinate their actions; one would fly to a higher altitude and use its active radar to search for targets, forwarding this data to the other missiles which remained at low altitude. The missiles were programmed so that half of a salvo would head for a carrier target, with the rest dividing between other ships. If the high-flying missile was shot down, another from the salvo would automatically pop up to take its place. All of the missiles would switch to active radar for the terminal phase of the attack
Source is wikipedia (a shit source but useful sometimes...)
I think you can take for granted that final attack run isn't performed in a straight line to assist the enemies defenses
They were supposed to be lunch from the different ships in the same time against a naval group. Now that kirovs and Oscars won't carry it anymore, they are useless if you have only 16 of them on each slava that won't work togather as they are in different fleets. It is a big missile not as fast as oniks and it os not using stealth technologies. Their main advantage was complexe attack approch in big numbers. Using them with oniks will be more difficult because the speed is not the same ajd we don't know if they can communicate togather.