Whatever I wanted to get across he understood well, -Is this mean "Whatever I want to tell him he understood me well"?
in a seat somewhat removed from the bartender’s post. -Is this mean "a seat far away from bartender"? Full sentence (I sat down beside him at his invitation, in a seat somewhat removed from the bartender’s post.)
he could definitely hold his liquor -Is this mean "He's a strong drinker"? Full sentence (His drinks of choice was vodka. Despite his lean build he could definitely hold his liquor)
Kido-san had left vague in the interest of confidentiality, -Is this mean that "Kido-san were not telling all the truth because he wanted (interested) in keeping them private"? Full sentence (I investigate for myself various details that Kido-san had left vague in the interest of confidentiality,)
--Below are sentences that I can't understand at all--
in a rich man to boot! Full sentence (Kaido-san told taxi drivers the route with warmth and care an admirable quality in this day and age and in a rich man to boot!)
involving as they did a number of moving incidents Full sentence (The other stories this lawyer related were surprising, involving as they did a number of moving incidents about which Kaido-san himself had never spoken.)