recommendation for a 10 gauge power cable for a power conditioner.

I use Teflon plumbers tape wrapped around the plug body which sticks in the receptacle to make a tight fit to help hold the Pangea cord in place.
For some I also add on some 'Blu Tack" like stuff. Use a 1/2" sphere.. Roll it to get it sticky, then form a tube of it about 3:" long. Wrap it around the base of plug/IEC and press it down around the connection.
When removing it, lots will stick. Use the main ball of the blutack stuff and pat the sticking bits. They will all came off sticking to the body of the stuff. I have reused blobs of it for years, and dozens of times.
With the blu tack the plugs never come out on their own.
Plus it dampens vibrations at the plug interface.

Pangea power cord arrived today but the female side didnt fit into the Torus RM20 ....it wasnt that the female side of pangea was too big.  PROBLEM is the blades of the torus inlet dont match up to the pangea female side of the power cable....

Ordered the SR UEF black HC 10 gauge PC hopefully will fit in the Torus RM20 conditoner

Fits yay.... cord is 10AWG ....better than stock cord now lets see how good once warmed up

 lot of big conditioners use the IEC chassis male 20 amp connector. They have horizontal blades. where the 15 amp typical IEC has vertical blades.
Pangea has a 20 amp version, but since it is a rarer type, you specifically have to ask for it (it is in the catalog)
My Furman RE20i had the 20 amp type, but I took it off an used Furutech chassic IEC 15 (which has really nice thick heavy duty blades and screw down inside big enough to accept 10 gauge wire) So I could use any ordinary powercord.