AD8397ARDZ as a digital line driver

Hello, I'm using an AD8397ARDZ to make a simple, fast buffer capable to drive 50 ohm loads at 0-5V:

The input is a 0...3.3V HCMOS square wave at 10 kHz.

What I'm experiencing is a "tail" on the falling edge of the output waveform:

I suppose this is due to the common emitter output stage.

Is there a way to improve this behavior, apart from using a dual supply voltage (which I cannot do)?

I've tried to reduce the resistor values (the screenshot actually refers to the configuration R3=R4=220 ohms) but the improvement is quite small.

Thanks!

L.