GPU temps help

Hey guys.

Fired up my new build yesterday. My first ever water-cooled build. I'm having issues with GPU temps here. I'm assuming I should probably do a tear down and reset my GPU water block. Just looking for a bit of advice or recommendations from the community as this is my first dive into watercooling and everything is self taught via the internet.

Temps taken from HWInfo

While "idle" sitting at my desktop (and downloading games from Steam) my GPU sits at about 65 - 70 Celsius, which seems insanely high. My fluid T_sensor temp is 28°C. CPU package hovers between 35 - 40 Celsius. While doing a quick gaming test, my GPU will jump up to about 90°C. CPU package will hover around 45 - 50 Celsius

Some additional info:

i9-14900k Asus ROG 4090 OC Lian Li O11D Evo XL EK waterblocks and distro plate.

The pump is connected to my Mobo's W_Pump+ header and running at 100% currently and my tubes are all connected to the proper inlet / outlet openings on the distro plate. Am I correct in assuming my first step would be to drain the loop and rebuild my GPU waterblock making sure everything is 100% correct with that?

Thanks in advance!