Nice job on the baits and working to solve the problems. I have used vudu and had it melt but don't throw it often, once the issues are worked out I can see myself throwing it more often. May I suggest using a better package? I wouldn't have a problem leaving them in the original package, but I think an issue is when we change lures and just throw them into a pile of lures we are using that day (if switching it up to see what they want).
Maybe something like this
http://www.ebay.com/itm/plastic-stor...1070%26ps%3D54