The threaded rod adjusting the 1st stage is self explanatory once the stock is removed.
The 2mm (?) Allen screw is hidden in front of the trigger blade. I screwed mine in in stages until it wouldn't cock then backed it off ever so slightly until it did. Now they are both (Reggie & Ronnie) far better than the factory settings. Try the stock bump test after.
Ive also removed the 'O' ring in the front bridge to make the barrel a bit more free floating.
HTH
Ian