Less is more with Romo. Once he starts throwing more than 35 passes, his performance drops on those particular passes.
Again, you're confusing cause and effect. Merely throwing fewer passes is not what made us a better team. First, we became a better team -- mainly because of OL improvements made through the draft -- and this resulted in more leads and fewer pass attempts. Teams don't throw as often when they're not behind as often. They also don't throw as often when they've got an OL that can impose its will on defenses. Try using the "less Romo" formula with the 2012 OL and see what happens.
Also, I'd like to see your evidence that Romo's performance level drops after a high number of attempts in a game. The only splits I could find were for 31+ attempts, and there's no drop in his performance compared to the top quarterbacks in the league. The numbers below are for each QB's last 5 full seasons. The split includes the 31st pass attempt of the game, and
all subsequent attempts. Maybe you have data that shows that Romo blows the roof off with attempts 31-35?
after 30 attempts in a game
Rodgers 224 of 337 2989 30 7 115.4
PManning 490 of 758 5587 48 21 96.2
Brady 400 of 648 4605 36 13 93.3
Brees 573 of 904 6517 51 26 91.8
Romo 278 of 445 3251 24 13 90.4
on attempts 1-30 of a game
Rodgers 1337 of 2004 16796 138 29 109.5
Romo 1486 of 2246 17853 126 44 100.9
PManning 1598 of 2331 18477 149 48 105.0
Brees 1666 of 2389 18862 143 58 102.9
Brady 1479 of 2302 17807 132 31 101.4
difference in passer rating after 30 attempts
Rodgers +5.9
Brady -8.1
PManning -8.8
Romo -10.5
Brees -11.1
Rodgers is known for his risk aversion, and taking a lot of sacks late in close games. His record in 4th-qtr comebacks and game-winning drives reflects this more than his passer rating would. But the norm for the rest of these QB after 30 attempts is that their rating drops 8-11 points. If you're still throwing after 30 attempts, it's more likely that the outcome of the game is still in doubt, and also more likely that your team is behind. By no means is it a given, but certainly more likely.
It's also important to note that, while the effect on Romo's rating is in line with that of Brees, Manning, and Brady after 30 attempts, the situations his team is in during these attempts are quite different over the last five seasons. After 30 attempts, Romo has been much more likely to be trailing in the game, and much less likely to be playing with a comfortable lead than any of these other players. So one would expect Romo's rating to drop noticeably compared to the league's elite QB after 30 attempts, but it doesn't.
games entering 4th qtr leading by more than one score
Brady 38
PManning 35
Rodgers 35
Brees 28
Romo 18
games entering 4th qtr trailing
Romo 46
Brees 34
Brady 28
PManning 28
Rodgers 27