I did the same thing, with a pair of Sly-Dog Powder Hounds.
I removed the skag, clamped angle iron on it, and let it sit for 7 days. It has a little "wrinkle" at the bend, but thus far no problem.
If you choose to use heat, I would not use anything more than a hair dryer.
Both the Sly-Dogs and the Grippers are made from UHMW, Ultra-High Molecular Weight Plastic, and will lose it's memoery with a little heat.
HDPE will not. (High Density Poly-ethelyne)
In any plastic, if you have bent it, and the bend area has lightnede up in color, it has been thermally modified due to friction, and is usually very weak at that area.