You really don't need to tweak it. Default is extremely complete and solid. If you wish, you could set some modules like SONAR to "aggressive" but this will definitely increase false positives.
Default is strong and has never failed me.
I agree. I disabled it because it's unusable for me. I have a bit of heating problems (nothing to do with Norton), I need to replace the thermal paste. But using Norton's cryptominer is impossible, it literally makes my heating issue 100% worse to the point where my whole system crashes and the PC turns off.
