My best suggestion is to stop trying to fix a beer that is not as good as you like. You have already added a ton of chocolate. Is it sweetness that you lack? If you simply lack chocolate flavor perhaps you could increase the chocolate malt. Ideally I avoid post fermentation additions unless the flavor can not be created with malt, yeast, and hops.
I like Crisp chocolate for a pure chocolate taste and MFB chocolate for a more complex raisin and dark chocolate flavor.
Try it again.
can you post your recipe and any results?