Super Tigres are great engines, but mine is a little sensitive to the mixture.

First suggestion would be to have an experienced pilot check it over and take it up for the first time. If your Corsair has never been trimmed and/or balanced it might explain why it doesn't fly well. You've also fallen into the classic "bought a warplane" syndrome that spoils the dream for many, many beginning pilots. You're treating the symptoms properly with this plane. I've never flown a little electric like that, but I imagine they are a handful in any wind at all. IMHO the bigger the trainer, the easier it is to fly.

If you decide to go it alone (don't) you should spend several tankfulls getting the engine to run well. Follow the ST manual. Be sure to balance the plane as the instructions describe. Put the control rod to the wheel in the outermost hole on the axle and the innermost hole on the servo for the least movement. Center the rudder and roll it in your garage or driveway. It should roll straight with the rudder centered (to begin with).

Take the plane to the field whan you have a lot of time. NEVER get impatient when starting out. Taxi the plane up and down the runway to get the feel of ground handling. Then try a few short hops with the wheels just off the ground.

But I guarantee you'll do better in every way with an instructor.