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I like the muted colours you have used. That said I use a white undercoat and that brightens the base colours and a wash of thinned acrylic paint. Then matt varnish.
You can mitigate the effect somewhat by gloss varnishing the miniature before you apply the wash.
Try gloss varnish before the wash and them matt varnish on the finished figure.
I'm curious what you're even using the wash for?It's generally used as a sort of hack for shading, but you seem to to a wonderful job of shading and highlight without it. Applying the wash doesn't seem to have any effect other than darkening the tone.If you don't want the tone darkened, then why use it?
Strong tone? Sounds like a very dark wash, could you switch to a different colour? Or thin it, with a flow enhancer or a matte medium, would be my inclination.