This is a fantastic thread that I'm following along intently! I too struggle with creating a realistic "Earth-Like" fictional world and the posts in this discussion are incredibly helpful. Thanks to all involved!
A stab at tectonic plates...not everything here makes sense as is, and you may want to move some of the mountains...
(I'm a paleontologist, not a geologist, so if something here doesn't work don't be TOO surprised!)