The 140 protein is interesting. Studies I have seen suggest that protein synthesis is at its maximum at about .7 grams per pound. For me this would be around 140 grams a day. Keto, you may know, turns off/down gluconeogenesis, so in theory 140 would be about the level to produce maximum protein synthesis without having any left to turn into glucose. It makes sense that keto would be turned off when you are consuming protein above the level that increases the rate of protein synthesis.
I have felt that the main reason why some people see greater muscle gains at higher protein levels, like 300+ is because the extra protein basically stimulates a slow, steady release of insulin all day and into the night, IOW its the steady but increased insulin not the extra protein that causes these very high protein diets to increase muscle.