Why did production reduce the number of Fast Forwards so drastically?
The reason for this is probably to reduce production expenses. Production often spends a lot of money setting up elaborate Fast Forwards, and that money is completely wasted if no team even tries to claim them. Drastically reducing the number of Fast Forwards both reduces expenses and makes it much more likely that they will be claimed when offered. The teams of TAR5 knew going in that there would only be two Fast Forwards (but did not know which two legs they were on, of course).