is this your first 3310 mouse? TBH i have the same laggy/sluggish feeling on every 3310. Someone say this is a "controlled" sensor, for me it's just laggy =). fk1, rival and ec2-a they feel laggish to me compared to every 3090, AM010 and 3988.
my favourite implementation, sensor wise, is the fk1, but, because of the super****ty buttons (huanos + superstiffshell) i prefer the ec2-a.