Advice needed on Flicker Fixed for Amiga 2000?

[Retronaut]

Hey, so I have a Piccollo SD64 RTG card, and it works fine. Only issue is passthrough cable shows NOTHING, I am informed it needs a flicker fixed to get the Amiga's native output up to the same Hz level as native VGA. That being said, does anyone know of a solution for this, an external or internal Flicker-Fixer?

[AmigaPete]

The Commodore A2320 is the original "fixer". There are many others but you can't go wrong with the A2320.