And yet another update:
I've made some slight modifications to the tectonics (nothing major, just a few microplates, and a reworking of the Agalhaic Ridge). Also, I added some new landmasses, mainly in the form of a new "wing" to the southeastern continent of Anapar. In the new map, there are also yellow lines showing developing Rifts, intended to show places similar to the Great Rift Valley in Africa or the West Antarctic Rift.
Aduhr Tectonics V.jpg
With the addition of new land masses, I'm now at 27,5 % land area, which I suppose I can live with. So, I think I'm finished with the coastlines and tectonics at this point. As usual, suggestions, criticisms and comments are highly appreciated!