This will really hurt your overall damage but if you need it to kill pillars then do it. ~40-45ish seconds before pilars pop just sit on your bestial wrath along with as many focus fire stacks as you can get (ideal 5) as BM. BW + FF + barrage and hit 2 pillars + the boss with it. Go nuts.
I dont really think saving stampede for it is a good idea, thats just murdering your boss damage a bit too much. Stampede last 40 seconds and the pillars are up for ~15 so meh. BW + 5 stack FF should be enough.
We didn't have any boomies and had a lot of mdps when we came up to M Kromog so I needed a lot of aoe and some cheeky pillar dmg, so I stayed BM and rolled blink strikes, barrage and steady focus. We soon made a healer change to boomy and like 2 shot it afterwards. If I had a choice specifically for pillar dmg MM would be best with crows and barrage.
If we didnt need the aoe so much for thogar I would roll MM just to smash the canons and man at arms quicker :/
Also popping stampede on pillars is fine... for the first set.. then gg after that haha
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Try progging without a boomkin and a lot of mdps.. Then you realize its more of a joke how important raid comp is on some fights
We get what we can ensuring the people can play well. Our realm isn't that big, anyone decent usually goes to one shot or point break. But we're doing ok with 10/10M HM and 6/10M BRF whilst still missing nights due to lack of numbers..
Even still, if you had 2 boomies on that fight you could probably fill the rest of the dps spots with potatoes and still down him first night