Hey Mate, maybe we can work together on this Ol'Sport.
Here is the 1000 point list I am working on, following the same ideas:
http://www.dakkadakka.com/dakkaforum/posts/list/563100.page
What I theorize, since it has yet to be fully tested by myself, is that you need multiple units outflanking with your platoon. This gives you more forces supporting eachother and overall more chances to hit than to miss in this "hit or miss" scenario.
Units like Scout Sentinels, Harkervets, Vendettas, and Stormtroopers are great for this.
When you raise the points to 1250 and up, adding Creed and some Hellhounds or
LRBTs to be outflanked aswell really compliments it nicely.
As far as your list goes, you really need some special weapons in the infantry squad. The plasma guns on the special weapon squads is always pricey and really fragile.
If you blob your infantry, they are gonna get destroyed in Assault unless you add a commissar (anti-sweep). Next, if a walker assaults them, they are not gonna be able to do anything about it. A 55 point Armoured Sentinel can tie up your 165 point blob for the whole game, stopping the whole attack. (Take meltabombs.) Next, since you are taking a commissar for the blob, give him a powersword and maybe sgt powerswords for anti
MEQ in assault to prevent massacres.
I think the main problem is
AT, you got 2
AT units and one of them is gonna get Instagibbed buy one multilaser while the other will get hit by every anti-tank gun your enemy has since you may very well lose both griffons 1st turn since they have to be within Lascannon range to shoot anything practically.
Give that stuff some thought for now.
cheers,
DaK