#pixel width

So apparently tumblr has changed the dashboard image dimensions from 500 width to 540 width. This particularly affects me because I generally use a mspaint/oekaki style of drawing which usually looks awful when resized. This would be fine except profiles are still set to 500 so if a 540 width image will look crisp and sharp on the dash, but blurry and shitty on my profile page. It’s maddening. Is there anyway I can fix this? If I could just go to the edit html page and copy/paste something to change the max image width on my profile that would be just swell.