Have you considered to buy a EK MLC and pre-filled waterblock for it? Might cost bit more but is much better solution than having VRMs and GDDR6 burning.
A single 140mm unit should be sufficient,
https://www.overclockers.co.uk/ek-w...nix-140mm-radiator-core-module-hs-003-ek.html
or better a 240mm
https://www.overclockers.co.uk/ek-w...nix-240mm-radiator-core-module-hs-004-ek.html
And a prefilled block like this
https://www.overclockers.co.uk/ek-w...ftw3-1080-ti-gpu-module-nickel-wc-9l6-ek.html
£250 is not a bad long term investment for a full blown watercooling, considering the cost of any top of the range card.
Next time you keep the MLC unit and upgrade the block. (or if you change to different block manufacturer, keep the tubing and fitting.
I have Predator 360 for 2 years now. Best investment ever made.
Have changed, 4 motherboards, 2 monoblocks, 1 block, 5 graphic cards blocks, and having atm non EK parts on GPU block (Bykski block for Vega 64 Nitro and Watercool Heatkiller IV on the V64 reference) using the EK tubing and fittings from my initial Fury Nano & GTX1080 Armor.
The performance is comparable to full custom loop, with none the drawbacks.
My next build going to have 2 240mm MLC units one for CPU/Monoblock the other for GPU.