The PF found himself 100kt fast because he followed the FD to 8 degreees nose down. I really wish we had more details, but I hope we can agree that-
- an ILS with the AP off and FDs on should not be considered a "high workload" environment for an airline pilot
- had the PF practised raw data flying more often, he would not have followed the FD to 8 degrees nose down
- flying raw data only when conditions make it "easy" doesn't do much for your skill and professional development