These suggestions for a -9(A). What works best in a short wing RV or an RV-10 or 12 might be different.
The proper soft field technique is to have 10 to 15 deployed, hold the stick all the way back, do not stop at the end of the runway. Remember, this is a soft field and you could sink in. As the plane starts to accelerate, give it some forward stick to keep the nose just an inch off the ground. This means you have to give it progressively more forward stick as you accelerate. When the plane lifts off, lower the nose some more to fly in ground effect as the plane gains more speed. Even with a FP prop, the plane will push you in the back of the seat once you are off the ground. After say 65 kts/ 70 MPH start your climb and establish your Vx or Vy speeds, depending on any obstructions on the field, as you retract the flaps.
If your nose is too high, you will make a longer than necessary takeoff roll. Too low and your front wheel will still be in the weeds.
BTW, the few times I have flow an ?A? model, I use the same technique even if on pavement.
Landings are another thing. Full flaps 65 to 70 MPH, depending on my load. Just before touchdown, I add very small amount of power to arrest the sink rate and just kiss the mains on. As soon as the mains are on, I pull the power off while working the stick aft. I let the nose drop on its own, again while holding the stick aft. The stick remains aft until shutdown.