Whatever filter you use, the exposure/development choice needs to take into consideration how the shadows are being illuminated
If your shadows are illuminated by a clear blue sky, then using any of the blue absorbing filters to lighten green foliage can darken the shadows since they contain that colder light, causing a degree of contrast that you may not want. Your exposure/development choice needs to consider this. You may have to increase the exposure a bit to support the shadows and then reduce development to keep the highlights in check. With the filter accounted for in the exposure choice, you should see where the important shadows are on the scale
Just a thought.