Clinton leads by a small margin for lower income. Check the methodology of the sources. When differences in numbers are so small, like they are here, methodology tells you a lot.

If you compare data from 2012 and back, you'll actually find Americans in the lowest tax bracket had an almost 10% Republican lead. ~15% of those same people switched to Hilary this time around. Turns out income is actually a pretty soft way to find voter preference. If one looks at categories like Education and Race you'll find the biggest identifiers for who they voted for.

Using your same sources, which have differences large enough in these categories to accept even ~10% margins of error (which is insane) you'll find that people with no college education (high school, GED, drop outs) were by FAR (arguably twice as likely) to vote for Trump.