No, here I use a power supply with 37V. The current is about 250mA.
With your recipe. But with a few drops of peroxide.
But I prefer the HVAC-method. The CG is more clear
and contains, besides gold, only a small amount of sodium citrate to stabilize.
HVAC left, electrolysis right. In transmitted light and reflected light.

The chemical reduction method, I have not tested.
How it looks in reflected light? (after a few days)