So would you swap the 1.5 meter cord out for the .5 meter one? My cartridge output is on the high side for a MC, .65.
In analog playback a CARTRIGE is NUMBER ONE thing. As much as your cartridge must be matched very well with tonearm, your speakers must be matched very well with your amp. If you already have some nice speakers for your analog rig then think about cartridge and try different ones, start with MM or MI. This is where you can notice a huge difference in sound immediately without breaking the bank. Until you will not find "your cartridge" do not bother with cables and stuff if they cost more than a cartridge.
If your 1.5m cable is very well shielded i wouldn’t bother. If you have some hum then you can try a better shielded cable. If your cable is good i don’t think you will notice any difference even if you will cut it in the middle and re-solder the connectors.
But if you will change your cartridge you will be shocked by the difference in sound you can hear immediately without changing anything else in your system. The best cartridges are not the most expensive ones for sure (experience is the key).