Gl703gs-ds74 temps and battery

I have been using my Gl703gs for 4-5 days and everything about the laptop is okish except the battery and temperature

CPU temperature is around 88 after undervolting -0.160mV while playing Rainbow 6 siege without repasting. Is this a OK temperature for laptop? I also planned to repaste with Kryonaut some time this week since I don't want to use liquid metal. Should I spread the paste with the spreader that is come with the package or should I just use my heatsink to spread the paste?

Another problem with this laptop is the battery. My battery is draining while it is plugged in and it shows "plugged in, discharging" when I am playing rainbow 6 siege for around a while. It drops to 94%. Is this a indication of a faulty charger/battery? Is there a way I can eliminate this problem? When the battery is 99% it will show "X minute until fully charge", Shouldn't the charger stop charging when the battery is almost full?

 

It is a bit higher than you would want it, repaste should probably put it down to 70s. Even tho Kryonaut is rather good I'd go with ICDiamond since it's the best thermal compound for notebooks alongside with GC Gelid.

No, the batterything is a feature Asus has implemented to give the components more power. The battery is being used as an extra power source.

 

I get a few BSOD (whea_uncorrectable_error), does it mean that I am undervolting too much causing instability to my system?

 

Jep. That error always accurs if you undervolt to much.