Roadkill can help us to find the tension areas (red/blu - green is good) and I used it to localize and apply Tighten on those areas. It's impossible to get full green colors for curved mesh:
When everything seems to be OK it's time to select all islands (in Body mode) and use Scale->Normalize Sizes followed by Remap UV->Stretch Optimization.
When everything seems to be OK it's time to select all islands (in Body mode) and use Scale->Normalize Sizes followed by Remap UV->Stretch Optimization.