Chili with bitter aftertaste and not enough kick
I've never known cayenne pepper to have any flavor, so if it is bitter you may have a bad batch, or the brand you are using may have put in additives that give it a bitter flavor. You may have other sources of bitterness:


beer: brewers add hops to beer to give it bitterness, and some beer is more bitter than others, it depends on which type you chose
Tomato paste: this can have a bitter taste if it is not fried off. If you add it directly to liquid it often adds bitterness to a dish
Kidney beans: I've always found that canned kidney beans have a bitter taste, even if rinsed


So there's other ways you could get bitter chili. I'd balance it out by adding some sugar or honey plus maybe a bit of lemon juice or tamarind paste.