I don't remember many players saying 1144 build was superior because it increased Full House's success rate. It was mostly for the WT when Cards/Pots and what not were heavy as hell. Of course, this was 5+ years ago. :x
I remember I did a similar test with a friend when Full House was just released and posted it here. We tested between 200 ~ 1000 LK and noticed no difference in terms of success : fail ratio.
Whenever a person says do 1144 Build to help Full House, it tends to be their own personal view (or superstition) that it actually helps. Not many players do actual tests when writing guides but rather say things based on their own experience.