if your arrows landed really close at 140 yards , you can tell there is the potential for accuracy with the lower anchor,,
it may not be practical for short range target shots,, but if you practice it , it can be accurate,,
when I shot clout shoots, I would anchor under my chin,,, and there is no reason why you can't have a different anchor for your normal close range shots,, and a clout shoot anchor,one of the best archers I know did this,,, one of the guys I competed against had a very low from the chest anchor,, and he shot better than most,, good luck with your shooting,,