I have 2 lightspeed mice (g502 and G Pro Superlight). Its all personal preference but I have found you don't really need to go any higher than 12k DPI to easily break through the AA bubble. In terms of report rate/polling, 1000hz works fairly well with lightspeed mice but I actually prefer to use 500hz as it mitigates some of my shaky unsteady hands. Edit your profiles on G-Hub then turn the mouse's onboard memory on making sure you have the correct profiles assigned to what you want to use on the Xim. I don't notice any lag using the mice in wireless mode. Have a look on rtings reviews, they will show you how good these mice are in terms of lag. Just in terms of syncs which you didn't mention, I used to play with sync off but then switched to common sync when I had a 60hz monitor, then default sync when I moved to a 120hz monitor which feels great at 12k dpi and 500hz polling. No issues breaking into targets bubbles and breaking back out again. I hope this helps!
