Your infantry squads feel like dead weight. No heavy, no special, what's the point? If you just want bubble wrap, 1 platoon with a conscripts squad + 1 veterans squad gets you more bodies for fewer points.
Your
LRMBT in heavy support is stupidly expensive; 200 points for an ap3 pie plate? No thanks. With the 4 russes you have, you can almost afford to take the steel host formation, giving all of your tanks in 12 of the commander preferred enemy, which will help out with their accuracy.
Pask is overrated and the only high priority target in your entire army. With the amount of D, haywire, and assault running around, I wouldn't count on him making that big of a splash, especially with a short range tank like the punisher.
Your tanks are bloated with extra gear that you won't need. Wyverns shouldn't be shot at since they are barrage and can indirect fire. If they do get shot at, enclosed crew compartment probably will not save them. Dozer blades are as far as I'd go, maybe cammo netting if you fight lots of drop pods.
I feel like you're trying to protect your assets too much; with guard, you don't care if 3 tanks die turn 1 because you've got 4 more in the backfield along with 200 las gun shots that are going to mess people up. Quantity has a quality of its own and you really aren't playing to the guard's strengths by trying to tack on durability to individual models.
That and you've written off infantry. Huge mistake. The infantry win you games and tanks support them to help make that happen. Let's do a quick comparison: for the price of the extra gear on your leman russ main battle tank, you could equip both of your platoon command squads with 3 flamers and a heavy flamer. That makes them a credible threat on top of being an objective secured unit, able to hose down things that get into your lines, or who can run forwards and blunt attacks coming in at you.
Even simple things like a heavy bolter and flamer for your infantry squads (10 points in total) would make them much more useful than the set up you currently have. Never mind taking things like ob sec chimera spam, conscripts, or demo special weapons squads to jump out of your vendettas.
Upshot: upgrades are fine as long as they do something. You have lots of upgrades that won't matter a jot, and none that could make the things you've spent points on any good. With guard, take squads/vehicles that specialize. Every entry needs a specific task and needs to be equipped for that task. Then take 2 or three more, because you can. Repeat for each task out there (Monstrous creature hunting, tank hunting, assault mitigation, anti-light infantry, anti-heavy infantry, objective grabbing, mobility).
Check out
http://cadiascreed40k.blogspot.com/ for some basic tips.