Your cartridge is low compliance anyway, no matter which loading you’re using.
Gold Note PH-10 phono stage will give you an amazing opportunity for MC cartridges, it’s brand new top quality product, you can find more information about it HERE
I am happy with this phono stage for most of my MC (i have many).
External PSU is a must have too
P.S. you can always try your Denon with SUT + MM phono stage as an alternative to your MC phono stage.
I'm pretty sure there are many better cartridges than your Zu DL103 with conical stylus, maybe it's time to try another cartridge with better stylus profile if you need more bass and better treble ?