Here is my advice (Imperial Guard 3 years) on how to fine tune that list:
CCS: 2x Plasma, Rocket Launcher, Officer of the Fleet, Chimera w/ heavy stubber.
Elite: Marbo is good )but does not create a lot of fire power, he is a well placed demo charge is all.)
Elite: The stormtrooper squads should do well as they are versatile but you can always exchange them for vets and put them in your vendettas to get an extra melta gun and maybe a demo charge for near the same cost and get a lot more fire power.
Fast: 3 x Vendetta- you can run into trouble here if the opponent has lite armor presence, maybe keep one a valkrye but put the rocket pods and have 2 vendetta.
Heavy: 4 medusa, the glass cannon, if it survives long enough it will wipe out any unit and do it well but can get blown up easy. Suggest running them in a squad of three and putting a leman russ or two in your other slots, or squad of three leman russ(basic battle cannons) and 1 and 1 medusa. Also, the manticore is very good at taking out av14 Maybe > 3 medusa, 1 Manticore and 1-3 leman Russ Battle Cannon.
Troop: vets w/ melta and chimera, add a Autocannon or rocket. Same with the Plasma vet squad.
Platoon: I assume your Platoon is riding in the vendettas- so eliminate one troop> PCS, 2x troops. That's three squads one for each vendetta, maybe put a heavy bolter or auto cannon in each of these squads so they can fire shots while capturing objectives (maybe even a sniper or grenade launcher if you have an extra 15 points or so).
Fort: Aegis line and comms link> I took out the astropath because having comms link and him is overkill, so alternatively you can keep astropath and exchange comms link for quad gun and get some skyfire.( its either re roll or 2+, not both unless you feel necessary.)
Allies: Space Marine, Dark Angel or chaos daemaons.
Hope this helps and doesn't take away too much from your style of play. Good luck and have fun!!!!!