If it's like my LV1, it's 10.5, and ramp after 3 as per the rules. I went in and tweaked mine to 10.2 and ramp after 5. So I don't get in any issues with weird chronos.
At Basildon I saw a guy with a stock luxe have to use a backup gun because the refs swore it was ramping too soon, even on stock settings. So better safe than sorry.