It is very telling to take a MIDI file of your arranger playing, and put it into a computer sequencer and look at your velocity values. Most of them have a piano roll display, where you can look at a visual representation of how hard (fast, whatever) you are striking the notes.

Ultra lightweight keyboards, you'll generally be surprised at how high up your average values are. Seems a shame to have all that dynamics available to you, but that you barely use half of it...