But I think that I have a bug to report regarding the SA-5:
-> The SA-5 fuse only seems to work when the missile (SA-5) passes VERY NEAR to the target. For example: I never managed to get a target detonation at distances more than 12 meters (normally I get target detonations at distances of 4-6 meters with the SA-5). This seems very odd since I can get target detonations at more than 100 meters with the SA-2 and even with the SA-3. So this means that getting a kill with the SA-5 is and will be much harder than getting a kill with the SA-2 since with the SA-5 in order to get a kill the missile must almost hit the target "by impact" which again is very odd since the SA-5 is supposed to be a much more advanced missile than the SA-2.

Vega warhead size is nearly identical to the Volhov.
Semi Active Guidance of the Vega is much more accurate, than the Command Guidance of the Volhov.

Most of the WarPact countries launched only few Vega missiles ever (due to the prohibitive cost), but the KUB (SA-6) missile that use similar guidance, often scored direct hits on the targets, at the firing ranges.