I've seen your papers in the proceedings of the WSC but had not mentioned them here for a few reasons:
o The studies do not look at tour pros so there is no validation vs what most would consider optimum
o A 'wider' takeaway is nothing exceptional and is taught by a number of professionals (note that this was also something that Moe did)
o While the golfers averaged a slightly greater distance the results varied widely
I had not seen the European congress paper but when the single digit handicapper in the study hits their 6-iron 137 yards they are clearly not a professional class gofer for the evaluation.
Given that all members here where I've seen reports that have improved their impact position by retaining the angle between their lead arm and club longer (as verified by video) have seen 10 yard or greater distance increases with their irons, there is an easy source for that magnitude of distance increase. To date the only methods that have proven themselves to accomplish this involve the opposite of your process in that wrist cock is set earlier rather than later. Also note that many here also have the experience of setting wrist cock at address (club horizontal) and having that work well for them. In fact the most accomplished tournament golfer that posts here uses that method.
Since your research does not compare a different methodology but rather one methodology vs the golfers 'natural' swing it's not possible to judge your technique vs others. Kevin has noted the distance improvement he gained from Bertholy and he does not report an equivalent effect on distance with the addition of MGS. Unfortunately the process needed to fix the too early 'release' of the golf club with earlier wrist cock that Kevin used to improve his impact position requires either a VERY long study and the alternative which some have used and objectively (video) works (setting wrist cock at address) is one that few would take to the course.