i also have not had success in general with the uptempo FB.
FB has its plusses and minuses, but i just think it is very difficult to sustain an elite type program that goes the sw16+ every year (in D1) with the FB. There are several minor reasons, but the major reason is the inability to slow things down in the years where your bench is not as deep. it would be difficult to field 10+ really good players every season, anyway, but when you factor in earlyentires... its pretty much impossible.
if you have 7 or 8 good players, that really doesnt hurt you much with the other offenses, but with the FB, its a death sentence.