As a pretty tall trackie, I've had a lot of difficulty finding a frame that fits correctly. Even most "XL" sized track bikes have an effective reach of no more than 440mm or effective stack of no more than 545mm. Additionally, most of these bikes are lower-end aluminum options, which at that size generally provides a less-than-acceptable amount of stiffness and coolness compared to carbon. While these issues probably seems like an eye-roller to a lot of you less outsized types, it's hardly a joke for we tall folk- particularly the more sprint-minded among us. A flimsy bike without enough length feels stupid, looks stupid, and fits stupid.
In order to solve a problem, the first step is to properly identify the problem. The poll above has a few options for what I would think are common(ish) problems that are found in stock "big" bikes. Please indulge me by selecting all that apply to your own situation. And respond to the thread! Let's start working out the problem.