Caveat: Have not ridden such an old Dark Series.
Your current board being a wide might be partially responsible for it not being playful (although the Dark is definitely not playful to begin with).
T. Rice is widely discussed on this forum (hint: use the search function). It is not a particularly playful board, but still more so than the Dark (especially a wide one). Whether it is the right board for you depends on your riding style and conditions/location.
And you are correct that you do not need a wide board - in fact at the appropriate length for your weight you might not even need a mid-wide (like the T. Rice).