In larger scales, IMO this method of weathering by "adding" becomes more obvious. If you think about how real aircraft weather...paint fades, chips and scratches... is done through removal of the paint to expose what lays underneath. Therefore, a more effective and realistic method is to do the exact same process. Start with the appropriate "base color", in this case a NMF and use a method (such as the salt technique) to remove paint to replicate the desired wear.
Or you it can be as simple as applying the color ultra thin to replicate fading or using a light touch with a polishing stick to thin the layer of paint. You could also apply liquid masks along those panel lines you want weathered. Paint the model and going back to remove the masking, exposing the NMF under it. Again, taking a polishing stick to 'ease' the demarcation line if desired or leave it as is for a "hard chip" effect.
Your build looks great! Hope this suggestion helps you as much as it helped me when someone shared it with me many moons ago.
Examples:
Faded effect by applying the final color ultra thin, leaving the skin somewhat exposed.
A light touch, a little water and a polishing stick to achieve some weathering by removing paint to expose the aircrafts "skin".
So if you are one who primes a model to expose any flaws in the plastic, consider using an appropriate "skin" color as your primer. Thus saving yourself a step in the process and the ability to weather your model the way real aircraft do...by "removing" to get the desired effect.