Here's some data on Iowa's history when facing Pac-12 teams over the past 35 years. You can interpret this in any way you like. It seems clear that the Hawks don't match up well with this conference, and haven't for a long time:
Records against Pac-12 foes since 1981:
Arizona – 4-2 (1982, 1987, 1996, 1998, 2009, 2010)
ASU – 1-2 (1997, 2003, 2004)
Washington – 1-2 (1982, 1991, 1995)
WSU – 0-0
Oregon – 0-2 (1989, 1994)
OSU – 0-0
Stanford – 0-1 (2016)
Cal – 0-1 (1993)
USC – 0-1 (2003)
UCLA – 1-1 (1981, 1986)
Colorado – 0-2 (1988, 1992 – Not a PAC-12 member when we played them)
Utah – 0-0
Overall – 7-14 (wins are in red)
In Bowls – 1-7
In the West (California/Arizona/Oregon) – 2-8 – Last wins were in 1982 and 1987
In neutral sites (Bowl Games in Texas/Florida) – 1-3
1981 Rose Bowl – Washington 28, Iowa 0
1986 Rose Bowl – UCLA 45, Iowa 28
1991 Rose Bowl – Washington 46, Iowa 34
1993 Alamo Bowl – Cal 37, Iowa 3
1995 Sun Bowl – Iowa 38, Washington 18
1997 Sun Bowl – ASU 17, Iowa 7
2003 Orange Bowl – USC 38, Iowa 17
2016 Rose Bowl – Stanford 45, Iowa 16
Pac-12 Opponent Bowl Scoring Average – 34.3 PPG
Iowa Bowl Scoring Average – 17.8 PPG
Minus 4th quarter ‘garbage’ points (7 TDs) – 11.8 PPG
Garbage TDs – 1986 (1), 1991 (2), 1997 (1), 2003 (1), 2016 (2)
All were 4th quarter touchdowns after the outcome was decided
Records against Pac-12 foes since 1981:
Arizona – 4-2 (1982, 1987, 1996, 1998, 2009, 2010)
ASU – 1-2 (1997, 2003, 2004)
Washington – 1-2 (1982, 1991, 1995)
WSU – 0-0
Oregon – 0-2 (1989, 1994)
OSU – 0-0
Stanford – 0-1 (2016)
Cal – 0-1 (1993)
USC – 0-1 (2003)
UCLA – 1-1 (1981, 1986)
Colorado – 0-2 (1988, 1992 – Not a PAC-12 member when we played them)
Utah – 0-0
Overall – 7-14 (wins are in red)
In Bowls – 1-7
In the West (California/Arizona/Oregon) – 2-8 – Last wins were in 1982 and 1987
In neutral sites (Bowl Games in Texas/Florida) – 1-3
1981 Rose Bowl – Washington 28, Iowa 0
1986 Rose Bowl – UCLA 45, Iowa 28
1991 Rose Bowl – Washington 46, Iowa 34
1993 Alamo Bowl – Cal 37, Iowa 3
1995 Sun Bowl – Iowa 38, Washington 18
1997 Sun Bowl – ASU 17, Iowa 7
2003 Orange Bowl – USC 38, Iowa 17
2016 Rose Bowl – Stanford 45, Iowa 16
Pac-12 Opponent Bowl Scoring Average – 34.3 PPG
Iowa Bowl Scoring Average – 17.8 PPG
Minus 4th quarter ‘garbage’ points (7 TDs) – 11.8 PPG
Garbage TDs – 1986 (1), 1991 (2), 1997 (1), 2003 (1), 2016 (2)
All were 4th quarter touchdowns after the outcome was decided