loadline calibration

So this is the first time I've overclocked but I think I get all the basic premises, but had a question for people with experience with Load Line Calibration. Firstly do LLC voltage spikes display in software or are they only viewable by using a multimeter? Because I'm trying to get an...

When it comes to vcore it is generally accepted that lower is better in the long run for the life of the CPU. However what I am reading - admittedly from the same sources - is that a lower loadline calibration and a higher set vcore in bios is better than a higher loadline calibration and a...