Hey reefcrazy, glad to hear you got'er going.
If you could describe how the drain hose or pipe runs down to your sump, maybe we can offer some suggestions. I use flexible hose, and have tinkered with it enough to know what I should do and not do to reduce bubbles and allow it to run as silent at possible.
How is your drain from the overflow "hooked" up to your sump, and what type of tube, hose or pipe are you using ?