Wallace cheated and colluded with the 'judges' of the experiment. In 1876, three judges of the Queen's bench ruled in Hampden's favour and arbitrator Walsh was ordered to return Hampden's money.
You may read the entire official court transcript
hereThe FE'r successfully sued as a result of that experiment.
So
Rowbotham - Found earth flat
Wallace - Result nulled by court of law
Lady Blount - Found earth flat.
The only "ouch that hurts" is for RErs who don't know much about the subject. Those that do would avoid like the plague.
Bedford Level experiments only ever proved earth flat.