If you really want to bubble wrap your tanks, blobs are much better option for that, than veterans. They cover large area making a deepstrike at half range of a melta gun impossible.
I would also personally put Pask in the punisher, because having rending on it is really great, much better then firing large plasma shot, because if you wanted that kind of shot, you could take a demolisher in the first place, which is S10 and does not get hot.
I am not a big fan of leman russes armed with battle canon, because a basilisk is cheaper and it can do a similar kind of work with its barrage earthshaker cannon.
Against Chaos, you really need more AA guns. If your vendetta gets shot, you'll be powerless against heldrakes. You could perhaps give some AA missile launchers to your veteran squads. Not exactly the best option available, but it's a possibility.
The Emperor protects.