I've tried all the iems in your other thread. Soul Byrd wouldn't stay in my ears too. In the end I've chosen Simgot EM2 which you didn't list. They are my recommendation.

Thanks for advice! I'll look into it.

Hello! I have the same question. Were you drym able to find anything better than hd669? I had Sony Xd150 (total crap), Logitech g433 (almost as good as hd669 but too much bass for my taste, slightly less details), and AudioTechnica M40x (less details, too much bass too).