Sort of following up on what
Grugknuckle is saying. If you have two Rune Priests, which are apparently going into your
IG Blobs, what are you doing with the Primaris Psyker? Do not underestimate the power of Orders! A
CCS can issue some very, very useful Orders to your Infantry Platoon. BID and
FOMT and GBITTF are absolutely amazing, if not essential.
I also dislike the Meltagun on the Infantry Squad. At BS3 and on foot, you aren't going to be in Melta range against a vehicle most likely. If you get Tank Shocked you can Death or Glory with a Sergeant and his Meltabombs. I'd rather see those all as Flamers. Wall of Death means that you get D3 automatic hits if you get charged, and since its a Template weapon offsets your
BS of 3. The number of hits you can do to a Space Marine squad with 3-5 Templates is absolutely staggering, and with S4 its likely to cause some damage even to a heavy infantry unit like that.
Also, where are your
HWT? Apparently you are deciding to have Autocannons in Chimeras? I'm not sure why. The Blob is a good place for
HWT with either Autocannons or Lascannons. Especially if you have a
CCS issuing BID or
FOMT and a large Blob.
The Griffons are cute, but 3 is probably overkill and
LRBT are probably a better bet. Higher
AV, and a more useful main cannon that can do almost everything the Griffon can (just can't ignore
LOS), and more (lower
AP and higher Strength). I'm not sure what the Vendettas are doing besides fire support. Its not required they do anything of course, but if your Platoon has squads going into 3 of them I'm curious as to why. Once they get out they'll be vulnerable.
If it were me I'd be taking a second look at what I'm trying to accomplish with the list.