Since you can’t reach 90fps, try locking to 45fps using Rivatuner. That gives me smoother performance on my G2 than leaving it uncapped, where fps will reach 50-60. Something to do with it being exactly half the refresh rate. It’s surprisingly smooth, basically perfect!
Having said that, I get microstutters now and again too, but only occasionally. Hoping a 3D chip can help there.