Well, you've posted a topic saying you would only be on momentarily, so not many people would respond to that. Your Cold Call topic is... well, Cold Call, a low rank event quest that almost everybody on this forum has done dozens of times, so you probably wont get much help for it from the older members. And as for the last one, you need to do a bit more follow through with the other people involved.
It also doesn't help that most of these posts are in relatively short notice, so I would recommend you give people a bit more of a delay between your post and the actual hunt if you want to see results.
If all of that fails then you can go into the chatbox, most of the people that play tri on there would gladly help you.