Keep in mind that If you're doing a pirouette correctly you shouldn't need the pole for balance. I would suggest practicing them away from the pole with ballet or jazz arms/prep
**Keep your shoulders down and back, this will prevent you from pushing your chest foward
**Think of the top of your head being pulled up by a string, it will start to help align your body and engaged your back/core
**Keep all stomach muscles contracted (without rounding your upper or lower back)
**To help your back from rounding while contracting your abs, push your bottom ribs forward and over your hips. They should feel slightly in front of the rest of your body