In a different vein, I noticed when I upgraded from the JMW9 tonearm to the JMW9 Signature on my Scoutmaster, that the stability of the imaging, the width and depth of soundstage and the weight and substance of instruments and vocals improved significantly -- it was an obvious difference that was immediately noticeable. It was one of the best $700 upgrades (if not THE best $700 upgrade) I have ever invested in. You may want to consider that upgrade as well as experimenting with cartridges.
Have fun exploring!
Have fun exploring!