If you are comfortable with AIWB, take a look at the JMCK Wing-Claw 2.5.
Your Bersa is not on the list, but, you'll get a general idea about using yaw and a wedge for better appendix concealment.
https://www.jmcustomkydex.com/p/AIWB-WC2-5.html
I'm roughly your height, but heavier, and don't have any trouble concealing a G19 AIWB using this holster. YMMV.
Just for holster availability alone, you may want to consider a different gun... Glock and S&W both have great options in both .380 or (preferred) single stack 9mm with much wider availability of holsters.
Welcome to the forum.
