I don't believe I even tried any of the bass settings other than the stock one, so yeah - I think IE8 has overblown bass even on the stock setting, unless you don't really have a seal. But in that case, the highs will become too thin and peaky.
I don't believe I've heard an IEM that sounds like HD650. Maybe Shure SE530/535 sounds similar, but they are too incoherent IMO. What qualities are you looking for exactly?
Edited by Pianist - 3/20/13 at 11:45am