If the right thrust doesn't do it there are a few geometry tricks for tailwheels as well. 1, the closer the main gear is to the Center of Gravity the better it handles, if the main gear is too far foreward of the CG it will be a handfull. 2, the wider the landing gear the better... this has more to do with tipping and dragging wingtips then directional control. 3, the lower the deck angle in 3 point attitude the easier it is to handle... this is limited by prop clearance and the shape of the fuselage, but a high deck angle means lots of P-factor on takeoff, In fact this is where the right thrust comes in. 4, the wheels should be toed in slightly.... a little toe in makes a big difference on ground handling. Even with all of these things done it is still a tailwheel, I have about 1500 hours of tailwheel time full size (most of it teaching tailwheel) and all of my models have been tailwheels so I know a thing or two about them. Tailwheel airplanes are unstable on the ground. This means that no matter how well the geometry of the model is setup the pilot will have to do a rudder dance on the ground. The key here is quick, short duration, rudder inputs... if you see the model swirve left and you apply right rudder until you see the model begin to turn right you have held the rudder too long.. now you'll just have to recover from the swirve that you have created to the right... this usually goes on back and forth down the runway until you get flying speed and it leaves the ground. The correct way to handle a tailwheel airplane on the ground is to respond to a swirve with a PULSE of opposite rudder. For example, if the model begins to swirve left respond with a stab of right rudder and then go back to neutral... there are three possible outcomes... 1, you didn't hold it long enough and the model continues left, then simply continue with more stabs of rudder going back to neutral each time until you stop the swirve. 2, the swirve is stopped and the model is then tracking straight again, which is unlikely. or 3, you held the rudder too long and you have a swirve in the opposite direction now... this is the most common. The best way to learn this is to stand directly behind the model instead of beside the runway like most fields.... and just use about 1/4 throttle to do taxi runs down the runway... force yourself to get the hang of the handling on the ground before you go the next step and takeoff.

Ty
The combo of good setup and good practice should take care of your problem.

Ty