Just to give you guys a little perspective on this theme. Last time I ran it with the same cap/rules and 2004 won the World Series over 1981. The other playoff teams were: 2007, 1996, 1981, 2004, 1969, 1990, 2001, 2005.
If I remember correctly my 1980 team missed the wild card by a game & 1985, 1972, & 1988 all performed well and narrowly missed the playoffs.
I would like to keep this theme by using only the playoff teams from the year you choose instead of adding hypothetical playoff teams. The one concession I could make is adding teams where there was a 1 game playoff to determine division winners/wild card teams, such as the 1995 Angels.