Going less than 100 in tactics is not advised; you need at least 90 real skill in tactics, along with 90 real skill in your weapon, to use most special moves.
Consecrate Weapon doesn't add damage - it just increases the amount that gets through, based on their weakest resist (which means no effect on a maxed resist suit worn by the opposition). Tactics adds additional damage that is calculated outside the DI cap, and gets an additional bonus at 100 skill (modified).
Suggest you forget the idea of holding at 75 Tactics, and raise it to at least 90, then wear items that give you +10 to +30 more Tactics, if you can fit them into your suit.