Understand mate but what you have to realise is that very few people will give out such information due to legislation, even as a PM. You could be anybody.
To the best of my knowledge, recently manufactured rifles have anti-tamper measures inbuilt so that they cannot be adjusted by anyone other than the manufacturer or someone with an in depth knowledge of a particular rifle.
Try a heavyweight pellet any see how it goes.
PS. My mate bought a new 97k and when i ran it over the chrono it was doing 10.5 FPE after he'd put a tin of pellets through it and it kills rabbits stone dead at