So far the Pro-Ject Cherry Classic turntable with its original Ortofon 510 cartridge have served well. But tucked away in a box somewhere around here has been an Ortofon 2M Red cartridge. Not a major expense, very cheap even by US hifi standards, but I anticipated a significant upgrade from the 510.
I also had a very useful cartridge alignment tool especially for Pro-Ject tonearms so I dug it all out, took a deep breath and set about changing the cartridge.
At this point I am setting up by ear ... I increased the tracking weight to about 1.80gm and this has brought about a significant improvement, although I might just edge the weight up 0.05gm at a time to see if this helps.