If you do get all vowels or all consonants, you seem to get them at VERY convenient times. 
IMO, there's never a convenient time for either. Granted, it's less worrisome when I'm up by over 100 (like now

), but the way I see it, it evens out. When I have situations like that, I make fewer points (normally), and you make your run. There will come a point in the game when the same happens to you, and I'll make my run. Happens in nearly every game for nearly everybody. That's why I don't get too concerned when people go up on me. I know my time is going to come. SJ and Malthumb will tell you, I'm the king of the comeback.