I just went 2-1-2 with my old Imperial Fist List (custom traits) at Calgary Conflict and I have figured out a few problems with the list
Librarian
4 Termies with 2 AC's
3x 8 man Scout Squads with PF's
3x 6 man dev's w/ 3 M/L Infiltrate
2x speeders ac/hb
3x Whirlwinds
I found that Whirlwinds suck, they did lay down some good fire against bugs in a sustained attack mission, but overall, they were a letdown (I played guard, orks, bugs, marines, LOtD). Scouts are great when they hit HtH, and the librarian is overrated.
Here's my new list
Force Commander (termie armour)
4x Termies with 2 AC's
2x 8 man scouts w/ PF's
6 man las/plas
2x 6 man M/L dev squads inf (honour your wargear)
1x 6 man HB dev squad inf (honour your wargear)
2x speeder ac/hb
3x pred with Autocannons and HB
I was thinking about a rolling doom kinda scenario, with that much fire power being chucked downfield, most things won't be able to hold up.