I'm surprised you have so many left for Iron Pine Peak after putting so much work into it as you have said. I always found Frosthide and Arctic Peakstalker quite easy for the times I would always go around the zone in the past (many, many times). I don't believe either of those specific 2 will die from rifts or invasions either but I could be wrong. But they did spawn quite frequently and I doubt anything changed or broke to make that not happen.
As far as Mad Hogger and Blackblood Drake, I know Mad Hogger is pretty rare and I've only seen Blackblood Drake a handful of times and I'd say that can be too. I always had them though with little effort put into them, right place right time, the last one I needed months ago for Iron Pine Peak was Dagda Skullthumper that took a few weeks of about 1-2 times a day checks. I know a few people that would camp out for weeks for Mad Hogger though and usually find Blackblood Drake at those times or typically camp Mad Hogger, and sometimes go around the zone to look/kill rares, and come back for more camping.
That said, good luck to finding them though. You can try
this thread for Blackblood Drake but I've never seen these rare events before. But you may know about it already since you said you found the Swirling Tempest one.
I do agree with you that it would be nice for the old zone rares to be further looked at. Not just for me, since I have them all but 1, but for people in the future that want to do this achievement or those that still only have a few left. I sent Tacitus a message more than a few days ago asking if he ever have had time to look at Nela Valcuthren in Stonefield as that one I find to be the rarest mob in the game and the most ridiculous amount of time wasted to get.
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