it isn't really a matter of how often you feed, its how much you feed :-) 4 feedings a day could easily be equal to one person's single daily feeding. However, you could be over feeding if your 4 feedings are quite sizable portions.
As for the oil slick up top, I've found it is quite common with peninsula tanks where you have your main flow (powerheads) at one end of the tank because you're pushing all the water to the other end and by the time flow reaches the other end of that 6' tank it is quite weak so the surface at the other end of the tank doesn't tend to get a lot of movement. As suggested already, you may need additional powerheads to try and point at the surface directly at the other end of the tank or try to move your returns to the opposite end. This is one of the reasons why my returns are at the opposite end of my peninsula. The return a the opposite end to the overflow helps to push the surface water towards the overflow.
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