I have undergone the same procedure with success, 1. 56mm hammer spring FX 2. Fx hammer spring spacers x 2 3. First reg 190 4. second reg 165 5. Neilson slugs 55 gr 6, Adjust power wheel 7 I am at a constant 965 FPS with reference to the hammer adjustment screw approximately 1 to 1,5 turns...