Diamondback Energy (FANG 0.08%) has flown under the radar of many dividend investors. That's causing them to miss out on its high-octane dividend. The oil company pays a rapidly rising base dividend. On top of that, it routinely pays a variable dividend, which can be quite sizable.It gave investors a monster raise last quarter, paying a total of $3.37 per share (more than 300% above the second quarter's level). While its payout will fluctuate in the future, investors seeking big-time income potential should ...