The Kestrel was a good ship and Starwalker liked the ability to select damage types, something he missed about flying Rifters after he had moved to the blaster Merlin. Earlier in his career he had liked the simplicity of not choosing the damage type of ammunition to use and blasters had fitted that simple philosophy well.
The question that he had with rockets was whether to use Caldari Navy Faction rockets or Rage rockets. In general, he used faction rockets against all T1 frigates and most T2 frigates too. He knew that there were multiple factors involved such as explosion velocity and radius, ship speed and signature but he had not really gone beyond the general rule of thumb.
He had seen the ammunition guide from Sulieman Shouaa and in particular:
Scourge Rage - Does Kinetic damage. Use against targets larger than you, although can be used against targets the same ship size as you if they are webbed. Can be used on smaller targets if you have a target painter or two as well as a web on the target.
Starwalker knew that the slower the ship was moving the better for rockets and intuitively the guidance made sense but he just wanted to check it and so he turned to the missile damage calculator.
The chart from this calculator showed that for a frigate, with a signature radius somewhere around 35m, that if the target frigate was going faster than around 400 m/s then the faction rockets applied more damage.
As the signature radius increased so did the speed such that with a 50m signature radius the crossover point was around 500 m/s. Starwalker needed to pay more attention to the speed of webbed frigates.