Custom PC magazine is the place for all this sort of stuff.
The May 2021 issue dealt with a similar build to yours, even adding a waterblock to the RTX3080 GPU.
A key difference in the builds, is that theirs has the radiator fans at the top and side, with 3 fans at the front drawing air in. Is that the missing bit of your build, not enough drawing air in?
The article's instructions on installing the GPU waterblock.
Quote:
8 REMOVE GPU COOLER
You can see last issue’s guide for more details
on how to dismantle the RTX 3080 Founders
Edition, but we recommend duct tape or 3M
mounting tape to remove the magnetic screw
caps in the casing. After this, dismantling the
card is straightforward. The Corsair
waterblock we’ve used has its pads and paste
pre-applied, which saves a lot of time.
9 FIT GPU WATERBLOCK
All you need to do is clean the GPU core and
memory modules, remove any stray thermal
pads and place these back onto the original
heatsink; then place the waterblock on top.
Follow the instructions on how to secure it and
the backplate. Once it’s mounted, go ahead
and install the graphics card. We’ve used a
riser cable to mount our graphics card
vertically, so it’s visible through the
side window.
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Although the Apr 2021 article on dismantling the GPU is
5 pages long.