Well, I have used this Napier pellet lube, and it's quite good at lubricating the pellets. It also well revives the oxidized pellets. I used a spring-piston rifle wherein I have seen a rise of ftlbs depending upon how much you have put on your pellets. However, I would suggest you buy it once and see the result. Gloryfire Elite, Otis Elite Gun Cleaning Kit are some of the good gun cleaning kits.
However, do a normal cleaning of your gin on a regular basis, so that it keeps your gun away from oxidation, and don't forget to use a gun vise.
All the best and happy shooting