I am colorblind and I cant tell the difference between the colors. I been timing out skills in order to keep my DOTs on the mob ( i.e. Aero last for 16 secs which is about 6 cast of Stones before i need another Aero). I was going to make a post about the issue with the same suggestion as OP. I agree 100% with the suggestions, to the left and bigger icon would be great.

I do suggest as a quick hot fix would be change the color of the timer. I would suggest Yellow or Blue with a black border. This way everyone can at least see the difference until a more polished solution is reached.