Hm, glad to hear you at least tried it. Sorry to hear it didn't work out that well. Big Hammer actually has a crystal clear color called Everclear

http://www.swimbait.com/bighammer/images/hps40105.jpg

The photo above makes it look gray on the back but the lure really is clear and as far as I've seen it stays clear after use. It does pick up dust/dirt on it so a used one looks a bit dingy, but if you put a new one in the water it's like clear clear.

Granted the plastic in a Big Hammer is not the same as an injected lure. I don't know a ton about plastics but I gather that people use many variations. Maybe there's one out there somewhere that would work :)