I worked at Lockheed Martin and on both of these programs when both aircraft were being developed. There was no incentive to keep costs under control, and virtually no effort was made to do so until they got so high that the number of aircraft being bought began to be cut.
I also worked for LM at Fort Worth. I worked quality assurance and interfaced with DCAS/DCAA frequently. They always kept our feet to the fire on contract end item deliverables and cost. I never saw any evidence of what you claim. Where did you work and what did you do?