First thing is to put it through the chrono.
My guess is it maybe a little high.
Open up the Ventura on the load block. Take the pistol grip off with the 2 bolts at the side. There is a big nut at bottom that works a spring that acts on the hammer. You can back the hammer off until you get the right power.
This also takes pressure off the trigger. As you mentioned you then can move the first stage.
This sorted mine our brilliantly first time out.
The hammer can also be tight a little polish can help.
If it's still heavy give me a shout.