I see you have replaced all the electrolythic capacitors with MLCC ones. While they can be used as replacement in most places, using them as audio output capacitors is a mistake, unless you have used C0G ceramic. Those using X5R or X7R ceramic are highly nonlinear and add some distortion to the audio signal. This also apply to video signal coupling capacitors, but as modulator is removed, two of them are not needed anymore.
