Cartridge loading has that effect. "Loading down" to 100ohms is very low impedance and gives a nice round warm full bodied sound but can go to far and be fat and congested. Increasing to 200 opened it up by in effect asking for less current from the cartridge. When you fall in love, stop. If you want even greater dynamics, detail, and presence you might want to risk increasing even a bit more. No harm no foul and you can always go back.
Once you're happy with that, which Origin Live arm do you have? If it has VTA on the fly you can get really amazing improvement dialing that in.