If your tuning the motor (lsn or hsn) on the box, or before it's not fully warmed up, it probably will come in a little hot after a while (and I don't mean Megan Fox ) because it will have leaned out as the motors temp reaches it's normal running range (whatever that may be).
Motors are always a little blubbery when cold, then come right as they run up to temp. If you lean it when it is cold so it sounds right, it will be too lean after half a tank or so. What I am trying to say is - don't tune your motor until it is fully warmed up and the chassis has saturated with heat. But hey, if your system is working for you then that's cool (or hot perhaps ).