If your bids contain complex data or graphs, the formatting must be flexible enough to allow you to display them clearly. Headings must be clearly distinguishable from text. Corporate branding must not be overpowering. Once you have an agreed style it is important to use it diligently otherwise customers may be issued with ‘Frankenstein’ documents.
Take a fresh look at the document templates you use and decide if they really are fit for purpose. Often templates have been produced by marketing people and are not suitable for technical proposals.