It's not as simple as greens and yellows being harder of softer, they are completely different. Agreed the greens are a more natural rubber type that happens to grip better in the wet.
If it is just a bit damp or there are wet and dry patches on the track I often risk yellows as can give the faster laps. However once it's actually wet, don't even bother, they will be rubbish and go for either a BB or Schumacher green.
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