We stepped into raiding a few weeks ago and are getting progressively better. Magmaw's healing requirements stunned us for a while but eventually we got comfortable with it after we downed Omnitron no problem. We were getting him down to 30-40% each try and failing due to simple slip-ups like standing on Pillars, not moving out of Ignition, and so on. The strategy we used that day was having tank on one side of Magmaw and melee on the other side. Ranged were out and would alternate between two points and move back and forth taking care of adds.
The next day i join a PuG who were all very skilled players. We used the strategy where we all stack on melee except for the hunter who would stay out and control where the pillar lands, lay a trap, and ranged would turn and burn adds. The strategy was working perfect. We kept running into one problem though. Either right before or right after Magmaw gets chained down he would turn over to our rogue and just 1-shot him. Every single time. We tried everything. Soulstoning him, Guardian Spirit, and pally bubbles. We had the idea to have him run away during the impaled phase. That made us lose dps and Magmaw ended up 1 shotting a druid instead. Eventually we gave up.
Last night I tried with a guild run. We used the hunter standing out strategy. We ran into the same problem again. This time I was 1-shotted and I was the healer. From 100% to 0. Then our rogue was being hit just like with the PuG. I dont know if it was just the strategy or was wondering if other people had this problem. Is there something more i should know about the fight? Any help would be appreciated.