His hr/fb rate was 25.0% in your sample period (through May). That's not sustainable either. 10.3% for this season. His hr/fb rate for the last 5 seasons combined is 10.6%
Tough crowd... Iggy basically had a bad month. Since may 1...
10.03 k9
1.93 bb9
2.52 FIP
Career numbers...
10.63 k9
2.45 bb9
3.22 FIP
If we can upgrade him, sure. He's still pretty good though