I personally would throw out a squad of the ISC and get another Trencher squad without spec.
Then I would cut out one GL and one of the lmg specs an additional an Barrcuda and get a Hurricane Walker of your choice (I´d take the Guardian).
Move one Trencher Squad with the Walker for covering him and keep the other sniper in the back.
The Rest of the Trenchers goes with longer Range and the AR with the Barracuda.
Strategically place the GL and keep the ISC´s on the move.
Colonel in cover for Initiative and Murdoch with the ISC for TacSense.
The points should suffice and you stay maneuvarable for many tactical options.
You have left 14 point if I calculated right.
Throw then out one Trencher of the big squad plus the Laser optic of the colonel (you don´t need it anyway ;-)) and get a Trencher Captain for the points.
Now with 2 points left grab a gasmask an kick some ass
But I´m no Imperial player.
Always saw them on the other side of the field and it never ended well for them
.
But if I had to hurt me i would try the proposed force.