We also are a computer validation company. There are many ways to skin a cat and no one way is correct. The purpose of validation is to demonstrate confidence in the system. You are the one that must be confident with the system and whoever does the validation. Rarely do inspectors cite validation defeciencies.
If you have any questions feel free to contact me. Gregory Francis, Korchek Technologies, 877-KOR-CHEK, greg@korchek.com