Interesting that you use half-cosine-down. When I've tested, half-cosine-up, cosine-up or power-up seem to be best, basically the up's rather than down. I imagine this is because the initial generations have the most effect so it's better to scale up the CFG rather than start aggressive and lower it, though might be wrong. Always good to try different settings though from time to time as you can get nice surprises that way. Also "raw" makes images more gritty and rough, which might be what you wanted here. Some think it encourages better image quality, which it absolutely doesn't.