boxrec is not accurate - many fighters make themselves taller and people like to make certain fighters taller- Bob Satterfield was 5"10 180ish and when he fought Nino Valdes, you could see the difference in height and weight. I saw clips of Vingo vs Marciano and Vingo was a few inches taller and had some wide shoulders, so you are correct.
In which fights did Henry wear the cuffs? His losses were to Bivins, Johnson, Moore, Slade, and Jackson? As for Bivins, Johnson, Moore, and Jackson--Henry wearing cuffs is not necessary to explain any of these losses. Slade? An erratic fighter, but one good enough to beat Jackson twice. So not hard to explain. The last loss was to Frank Buford. Henry went the distance with Buford three times, winning two and losing one. I suppose this is the loss one would have to concentrate on. My take is that Henry is overrated. Of the fights of his I have seen, he looked good against Baker and Satterfield. He struggled and looked mediocre against Agramonte.
I can't be specific but its believed he boxed to orders.if you disagree it won't break my heart. eg This may have been a betting coup. Henry, managed by notorious organized crime figure Frank (Blinky) Palermo, entered the fight as the No. 3 heavyweight contender. Henry was an overwhelming favorite. There weren't any betting odds on the fight unless someone wanted to bet on what round Johnson would get knocked out.