"Also if these charts were promoted and given higher attention on the website they would hopefully be used more and users won't rely mostly on food scores."
With hindsight my word "mostly" would be written in italic as that is what I'm trying to put across albeit, clumsily.
The charts on the website follow list of ingredients and an old boot could prop up the protein (and be somewhat disguised in the list), and this shows where scoring should not be dismissed.
Yet it is invaluable to have the charts - having had a dog with specific needs that relied on low protein, low ash, low fat, moderate fibre.
Perhaps David will further promote the charts as they may be a building block to coding for dogs with specific dietary needs for health reasons.