Sounds like a case where you would usually push through by yourself, but given what happened last time I think you would be better getting some extra help and getting the product out sooner.

I know a couple of outsourcing companies so I can give you a few pointers, good companies have NDAs and other contracts in place to protect you and your IP, usually they have US presence and they have workers on aligned timezones. I can say such companies are not rock bottom cheap but the quality and security it comes with them might be worth every penny (while also being cheaper than getting a full US team).

If you like I can pass you a few contacts in case you'll like to go this path.