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

I tried one of the wide-girth Pangea cords (forget which awg, the big one).  It was so heavy it pulled itself out of the connector socket on the back of the unit, even though it was pretty close to the floor.  Everything needs to fit very snugly to stay in properly.

Well if doesnt fit plan B is the Synergistic Research UEF HC Black power cable 10gauge $550 and most of my cabling is Synergistics anyway

You can take a look at Triode Wire Labs: High End Cables at Budget Friendly Prices - Triode Wire Labs and still stay within your budget.

As much as I liked Zu PCs and Cullen Cable PCs, TWL cables bettered both of them (not by a large margin, but still...,). And, if you go for the Pangea line, Joe Levy of Tempo Electric knows the guy who makes them and told me it's a good PC, and he makes great speaker cables. 

All the best,
Nonoise

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....