Welcome to the Strelets Forum. Please feel free to discuss any aspect of 1/72 scale plastic figures, not simply Strelets. If you have any questions about our products then we will answer them here.
I've never been a fan of Vallejo washes as I found them too thin also. Try more aggressive Tamiya: black, dark brown, brown panel washes, and also Citadel: Nuln Oil, Agrax Earthshade, and they have a few different green washes (Coelia Greenshade, Biel-Tan Green, Athonian Camoshade) also. Tamiya and Citadel are my most used washes, and the results will amaze. Even Citadel's Contrast Dark Angels Green on white or grey primer might work?