The Halo head bands help to direct the sweat to the sides of your face. For those not familiar with Halo bands, there is a flexible plastic sorta strip bonded on the inside @ the brow. While it keeps it out of your eyes, it still drips down the sides of your face.
I sweat easily too and it has nothing to do with how much one weighs, as I'm thin. The only way to deal with it is to literally keep a cloth of some kind in hand to frequently wipe my brow. Wetting it before I ride actually helps. Since I don't wear jerseys with pockets, I simply configure the cloth underneath one finger so as to not effect my grip. I realize it's hard to put that into words, but trust me, you'd figure out.
Then there's even the body cooling aspect to even begin with. I wear an Under Armor heatgear compression top under a polo shirt with bib shorts. I used to just wear a short sleeve jersey, or no shirt at all, when I was young-er and silly-er. I love the sun and the heat, but somehow I realized that wearing more clothes in the heat while cycling(self created breeze) can actually keep you cooler. At first riding I feel really hot, like "what was I thinking ?", but once I begin to sweat and is transferred to the shirt, evaporative cooling happens. Plus, wetting my head and cycling cap(Headsweats Cycle Cap has a sweat band) helps tremendously. I mean it all cools so well that after a bathroom break I can get goosepimples upon starting again even when it's warm. Sweat eventually starts dripping down my face, and that's what the cloth is for, as nothing beats wiping the brow.
I also carry some extra water so I can wet my face and head if need be. This may not seem like much, but it feels surprisingly refreshing in the midst of a ride as it clears all that accumulated sweat off your face.