Improving your academic writing

What are some strategies for improving your academic writing? I'm spending a lot of energy trying to improve my writing, more than on my content sometimes. I guess in undergrad I didn't hone my writing skills as much as I should and now it's catching up to me, I'm currently a 1st year grad and want to continue to get my PhD but since I feel like writing is currently kicking my butt I am even reconsidering that track. Is there a writing guide that people use? In another post Howard Becker was suggested.