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Old 19th September 2019
  #3
A waveform display doesn't show frequency density (energy) and doesn't represent perceived loudness.

A spectrogram can provide you with a visual representation of the energy distribution within your mix/master.

What makes one mix sound louder than another, with the same waveform display height, is the distribution of energy, including harmonics, and transient detail.

Matching a mix to a reference track during mastering is constrained by the mix, not necessarily the skill of the mastering engineer.

Rather than focus on maximum loudness I recommend focusing on dynamic range: a quieter master with a healthy dynamic range will have more impact on the listener than a louder master with a low dynamic range.

Check the mix/master with a loudness meter that displays crest factor, PSR or PLR.

Continue to work with your mastering engineer(s) until you are happy with the final product.

I would also like to hear the pre-master - there may be opportunities to optimize the mix.