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End gap has a LOT of variables. The most significant being ring material and application. A steel ring needs a diff gap compared to a moly ring, a heavy nitrous application needs a different endgap than say a mild street motor, etc.
Backspace you typically want as tight as you can without binding up when at temperature...once again, ring material comes into play. A larger backspace can be useful with gas ported pistons for instance. .025 sounds on the large side. I'd get up with Total Seal, they should know more than anyone....
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.