xDrip Settings To Use - Better Accuracy

Everyone - looking for input to increase the accuracy of my xDrip readings. I am running the latest version on a LG v30/G5 Dexcom with Android 8.0. xDrip reports approx 30 points lower than my BS readings when I test when my BS are flatling. I also have noticed the same results when I was testing the Freestyle Libre + Maiomaio integration. From a settings standpoint, for the most part I use the standard settings. Again any input would be greatly appreciated.

Maybe I’m missing something but why are you questioning the accuracy of xDrip and not the Libre?