Sorry to hear you don't have warranty in Brazil.

The only thing I would replace the Strix cooler with is the EKFC (Full Cover) water block and back plate, the EK water block does liquid cool the vrm's and would do the best cooling with a custom loop but would cost ALOT more.

https://www.ekwb.com/shop/ek-fc-1080-gtx-ti-strix-nickel

To me it wouldn't be worth it for a 10% increase in cooling with the Kraken x41 and G12, 72c is very good temp especially in a warm room such as yours.

You're welcome

There is alot of information online how to install a custom loop, EK is one of the best manufacturers of waterblocks, radiators, pumps, tubing, fittings etc....

Your case has good radiator support, that's a good start right there.

Front - 2 x 140 or 3 x 120
Top - 2 x 140 or 3 x 120
Rear - 1 x 140/120

Next you'll want to see if there's room for everything, there are alot of options and one is to get a pump/res combo to help save space and there are different kinds.

Here are 2 from EK..

pump/cylinder reservoir combo, this one has RGB and supports Aura Sync.

https://www.ekwb.com/shop/ek-xres-140-revo-d5-rgb-pwm-incl-sl-pump

Pump/reservoir combo, this one will mount in two 5.25" drive bays.

https://www.ekwb.com/shop/ek-dbay-d5-pwm-incl-pump

Remember I said it will cost alot more? It's going to cost around $1,000 - $1,500 and if you do it you might as well do the cpu. You can get ram water blocks if you want them too, as I said there's alot of options.

First decide if you want to spend that much.

What cpu cooler do you have now ?

Before buying anything read up on it so you have an idea of what what you'll need/want and to avoid costly mistakes, then ask any questions you may have.

Here is a list of EK cpu waterblocks for the ASUS TUF x299 Mark 1, I see they don't have a monoblock for your motherboard.

https://www.ekwb.com/configurator/step1_complist?mb_mbs=2622

You'll want to check the serial number of your Strix 1080 Ti to make sure it's compatible.

https://www.ekwb.com/shop/ek-fc-1080-gtx-ti-strix-nickel

Would you want a Pump/Res combo ?

Tubing - There is soft tubing and hard tubing, for a first timer I'd recommend soft tubing as it's much easier to work with, you'll need a tube bending kit if you go with hard tubing.

Fittings - Whatever size tubing you go with is the size of fittings to get.

I went with the Koolance ERM-2K3U which is an external cooler. If you decide on this cooler go with Koolance coolant and tubing. This is the ERM - 3K3UA which has an aluminum radiator, there is one with a copper radiator too. The downside to this is you'll need two people to move your pc.

http://koolance.com/erm-3k3ua-liquid-cooling-system-aluminum

Im using Koolance 3/8 x 5/8 soft tubing with 3/8 x 5/8 Monsoon chain gun fittings and Koolance coolant.