Please post a screenshot of your wattage rails in HWinfo64, doing a full load test when you are hitting the power limit hard.
Then we will know what shunts you should use.
It depends on the ratio of slot power to single 8 pin power.
It seems like Asus and Founder's Edition cards use a smaller ratio. FE seems to be around Slot=40% of 8 pin, so 166 watts on 8 pin #1 = 66 watts on PCIE. (e.g. 166 + 166 + 66 = 400 watts).
So if 40% is your ratio, then 15 mOhm shunts will keep you at 87.78 mhz PCIE slot with a 1.33x multiplier for 15 mOhms
If we assume your max power limit is 400 watts:
(66 * 1.33 + 166 * 1.33 + 166 * 1.33) = 529 watts instead of 400 watts.
With 87 watts for your PCIE slot.
Can you kindly update your shunt calculator to allow people to enter a multiplier for the PCI express slot?
It seems different boards use a different multiplier, which throws off your calculator.
The calculator currently assumes a 50% multiplier for PCIE -->8 pin#1.
The FE cards and I think Asus cards use a lower multiplier if I'm not mistaken, from looking at @olrdtg 's posts of his PCIE to slot ratio earlier in this thread.
(this can be determined by anyone by dividing the PCIE watt usage into the 8 pin #1 watt usage when the card is at max power limit).
I think someone already determined eVGA cards use a higher ratio==the 50% ratio (which is why the 500W Bios caps at 450W on their card but caps at 500W on an Asus or MSI three-pin board).
Here you go... so looks like my ratio is 20% for PCIE slot and 40% for each of the 8 pin pcie power connectors. So with 8ohm shunt on PCIE, I would be pulling max around 120W from the PCIE slot. I am leaning towards going this route. Do you guys think a board like the Z490 Unify will be OK with pulling 120W on the pcie slot? I would rather have all 8mohm shunts, than have 5 5mohms and 1 15mohm on the PCIE shunt. The more power I can get "safely" the better... LOL. The above screenshot is a PNY reference board on gigabyte 390W OC bios, voltage and power limit maxed out in afterburner. But after Shunt, I plan to use the 480W strix bios, Thanh Nguyen has the exact same card, with 5mohm shunts on all the resistors, and he is using the 3X8pin 480W strix bios with no issues at all. With the Gigabyte bios, he was still hitting power limit for some reason, and his card couldn't hold high clocks...