I have been playing the Sea Vixen ever since I started playing war thunder and I have found that the Red Top missiles it recieves are 1. Inconsistent and tend to not blow up unless they *directly hit* their target 2. Firing at a distance of maximum distance of 1.3km has the best chance of a successful interception.
Red Tops are high altitude missiles, They perform scary things in thin air... so go high when firing them, they can also be partially slaved to radar (so make sure to use it or turn it off to be sure).
At first you treated the Red Top like a Aim9 J... later like a spiced up Aim9 B, what it is actually. 12km range... yeah at 11km altitude with a non maneuvering target.... Oh and fly the Vixen with minimum fuel.. 9 minutes is enough and it turns well, and climbs like a rocket!