I don’t own this addon nor the Corsair (yet) but some general advice with such aircraft, adding to what has been said above me.
The sim has problems on the ground, transitioning from the straight line taxi behaviour to the sensitivity of the rudder in the air. I noticed this in the Blackbox Cessna Birddog just like in the default tail draggers. You have to expect a change in the bahaviour of the rudder and have to get used to it for now. I hope they’ll fix that. (yes, fix. It’s an issue, even if it’s intended).
Second there is a huge amount of torque pulling your aircraft. The props are huge, the engine is powerful, the airplane is light in comparison. Keep in mind that your only controls are surfaces that work with the air, there is NO ground steering once you apply power. The tail wheel won’t help you anymore when 1500HP are pulling on your nose. (1500HP for 3000kg and no ground control, think about that…)
It’s been said above: First you need to apply power gently, make sure that your rudder and aileron have sufficient effect before you add more torque which you will have to be able to counter.
Then don’t pull the airplane up like an airliner, let it climb out. keep the nose on the horizon, let it accelerate, more speed means more lift means more climb. Once the gear is up (and potential flaps on other aircraft are retracted) you can reduce power and go into a more progressive climb.