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2 obvious would be Southern Plastics and D&J Plastics. Over the last year Southern has moved production out to Costa Rica and D&J was just recently acquired by GSM (company that bought Yamamoto a couple years ago. Since D&J's acquisition a lot of customers have been trying to get out of there) I am not sure if Leonard over at Baitjunkys is taking on any more injection work, its worth contacting him though. Another option if he's not taking any more clients would be James over at Samatis Baits, last I saw he was taking on some contract manufacturing. If you haven't looked into it much you are going to have to get some production molds made (depending on how many baits you are setting up) BaitJunkys and Zorn are the 2 top options. Both have a significant lead time. Whoever you get to manufacture will be able to provide the mold maker a mold layout for their machines. You will also be looking at 5K - 10K piece minimum production runs per colour as well. Good luck, Hope you find someone to set you up.

bugmolds has them in both stone and aluminum in several sizes and cavity counts.

The only problem I see using scent is that it takes a while for it to diffuse into the water whether the lure is still or moving and even less when it is oil based. Attacking a lure and holding on longer are claims scent advocates insist are factual and maybe so for vertical presentations, but in my case I always cast and retrieve horizontally to cover water. My shapes and action designs are the only thing I have confidence in even at the slowest retrieve.