Hi, Gorphy
I am not sure if this would help but I have seen it work for my tracks. Make sure you produce a song in the Daw when your PC volume is not too high. When one's PC volume is too high he tends to reduce volumes of instruments because it will sound too high. I am currently using earphones as my speakers and I set my PC volume to around 70% or even 60% if I want my song louder. This allows me to perceive volume as low hence I tend to master my tracks at an increased volume. Another is that some instruments and VSTs are low in volume themselves, but I tend to duplicate them even make them 3 if still low, but make sure the sound is not distorted.