solarized-light: excessively low contrast in gnus and erc

[memeplex]

What did you expect to happen?

When I open a news group with gnus I expect to get a visual cue that a post is marked as read, but not to the point that makes the message unreadable.

What actually happened?

Describe your attempts to resolve the issue

No response

Steps to reproduce

1. Configure gnus to open gmane (setq gnus-select-method '(nntp "news.gmane.io")).
2. Run gnus with M-x gnus.
3. List all groups with AA.
4. Subscribe to some group with u.
5. Read some message in the group.

Package commit

e716ddb

System Information

macOS Big Sur, emacs-28 branch built from sources with defaults + svg support.

[memeplex]

erc has also too low contrast cases, although not as much as gnus:

[memeplex]

Also:

[memeplex]

     `(gnus-group-mail-1-empty ((t (:foreground ,(doom-color 'base6)))))
     `(gnus-summary-normal-ancient ((t (:foreground ,(doom-color 'base6)))))

Moving these two faces fg from base5 to base6 produces a more legible output. gnus-group-mail-1-empty is inherited by many xxx-empty faces, in fact the face for the above screenshot is gnus-group-mail-3-empty, which inherits from gnus-group-mail-1-empty.