Concern regarding High GPU temperature

FMXA

To start off, i basically purchased this laptop few weeks ago and when i was playing ( plugged in charging) Batman Arkham knight (settings were mostly high) , my laptop was sorta over heating i guess? fans were abit loud. the keyboard area is still ok, not very hot but it was on the battery area( just slightly above they keypad lol).  So im a Tech **** but i did see across some solution such as sending to acer to repaste the thermal thingy? should i do that?  my fans were on AUTO and the gpu was hitting 99%..... Just want to know what i can do to help...attached picture for reference. My laptop is on a cooler master x3 notepal when i was gaming...

Pls let me know what are your thoughts...thanks alot...

Laptop model : PH315-51 helios 300, 16gb ram , Intel core i7-8750H CPU @ 2.20GHz