No need to worry about people going easy on new people. This place is pretty tame.
This is a very common problem for small speakers of this type, which is why I recommend not going with tiny satellite speakers. I reckon upgrading the front two or three should make a considerable improvement. The only problem is, because the receiver's amp doesn't deliver much power, you will not be able to go with very demanding speakers. You could pick up some smallish bookshelf speakers that should help out though. What's the budget?
According to the specs, at least 3 of the speakers should have tweeters, while the rears do not, though I'm not sure how they differentiate between the front and surround speakers because they look identical to me. Is it possible you have the fronts and the surrounds swapped?