We have that problem alot as far as speed. Sometimes they will see we are a dash and put us at 16,000 feet or so where we will do almost 370 knots true which is over 100 knots faster than most of the props we run with.
I dont really think it is a problem when we fly in the levels around 200-250 because most jets doing similiar stage lengths seem to be hanging out around the high 2's and low 3's so our speed is just fine out there. Some controllers think we are a slow jet and others dont know what to think, it is taking some getting used to for everyone. We can climb in a hurry though like others have said at IAS of 230-250 we can hold around 1500 FPM up to 250 with full pax and fuel.