Cartridges can become an addiction so I suggest patience first of all. You have a very nice deck, no matter what some people say online the deck and it's tonearm can support very good & expensive MM's & MC's. Also, the Technics tonearm is easy to understand, to set it up and change settings.
As others said, you have to give time to new cartridges and new setups, use records you know well, good pressings and with the best possible production to evaluate.
Study the different types of styluses, your two cartridges can be used as generators since the VM series & VM95 series accept different styluses. Study about capacitance (it affects MM cartridges), VTA, VTF and everything that will help you setup your cartridge better.
Experiment with headshells (another addiction), they come in different height, weight etc
For the future I suggest you to try a low MC if you can afford it. I was lucky to try one 15 years ago when everything was less expensive and it became my main cartridge. To do that, you need a good MM/MC phono stage with lots of different settings, not with just a switch between MM - MC.
When you decide to invest in a new cartridge (not just a different needle) try something different than AT, there are too many brands available so don't restrict yourself.
Apologies if you already know what I suggested to study but it doesn't hurt to check your settings again and again. Vinyl will never be perfect but we can try getting close.