Originally Posted by
Ozonation
I stand 5'11" and have the extended Brompton seat post. The bike fits me fine with length to spare. As others have said in this forum, you should get fitted properly. You gave your height in a previous thread and I'm quite sure you're shorter than me. Unless you have an extraordinarily long inseam, you need a proper fitting or else the bike is simply no good.
Earlier the OP wrote the he had two bike that fit him well. The OP should take the appropriate measurements from those bikes and compare them with the Flamingo. Otherwise I think Ozonation's point is correct.
If I'm thinking about the question correctly, the tapering shouldn't make any difference with respect to fit. The saddle is still on top and the length of the post determines how high it gets. Anyway, worrying about tapering and seatposts is silly until you take the measurements -- perhaps a few photos/video -- and compare them.