I intend to do just that (if I can ever get some free time). The 1 in 10 twist was not a spec for the M16, it was the recommendation made by the APG guys at the end of the SCHV developement that led to the AR10 being redesigned as the AR15. They had arrived at 1 in 10 as optimum for a 55gr bullet. At that point, around 1956, the program at APG essentially ended, and my dad was transferred to Egland AFB in Florida where he worked on airborne weapons systems. APG's involvement continued in testing the early AR15 designs and subtle refinements that were made prior to it being accepted. Its acceptence was held up by the Army again since it would directly endanger the role of Springfield Armory as the sole producer of small arms in peace time. General Curtis LeMay liked the weapon and wanted it for use as a perimeter defense weapon for aircrews, but the Army wouldn't budge because "it didn't meet their spec for that role". General LeMay, who knew my dad and his involvement, asked him for help and my dad wrote a new spec such that the CAR15 was the only weapon that could possibly fit the role (in terms of dimensions, weight, power, etc.). When LeMay demanded a weapon that could meet "his" new spec, the Army had no choice but to allow LeMay's initial purchase. If the developement program pissed off the brass, the new spec really got them angry. But, around that time the Army ceased being to sole supplier of arms to all the branches of service, JFK's guys were going to close Springfield, and a lot of the old guys were retiring, so Dad ended up getting promoted to national director of TECOM when he returned to APG in 1964.
The timeline of changes that were made to the AR15/M16 in the late `50's/early `60's is something I would need to sit down with my dad and his records to exactly nail down. He wasn't involved except after they figured out something was wrong, he issued a report titled "Improved performance of ammunition for the M16 rifle" or something to that effect in 1966. Davis had been working for Colt by then and my dad's role was more as an administrator until his retirement in 1972.