The discussion seems to boil down on how we perceive progression in science and technology. You say it has no real influence on the quality of human life, while I say that it can be both positive or negative. Just because there are two sides of the medal, it doesn't mean they balance out. Also, I think that the long run tendency is positive, even if terrible atrocities have happened and still happen. For me it is clear the trend is upwards in terms of health, freedom and intellect.
But besides that, progression in science and technology is not only driven by people who want to improve things, but also by human curiosity. So, even if you could convince everybody that life would not become better or worse by all those perceived improvements, then 'progression' would still continue.
Also, I just thought of a new point. The way we experience tragedy is to some extend relative to what we are used to and what we consider normal. In rich countries people get depressed when they do not get the promotion they expected while in other countries people may get equally depressed by loosing a newborn child (taking an extreme example). Just like a poor man can be happy with something small. This means indeed that progression has no lasting influence on the amount of 'perceived tragedy'. However, while progressing, we compare the new levels of tragedy with the old situation. So the act of progressing, rather than its outcome, determines the level of perceived tragedy. This means that while progressing there is always less perceived tragedy than in a situation without progress, regardless of the absolute characteristics of that situation.
The alternative you give for progression is contemplation and 'coping with tragic contingencies'. In the first post you ask if such a life is possible. I think the Amish came pretty close. They stopped progressing and still limit themselves to the technology that was available in the 1800s. But even while they are not progressing as a community, they might still do on individual levels. Fixing the farm or harvesting crops is also a form of work that can be used to find 'consolidation for our inexistence', as you call it in your first post. Just like most people nowadays are not working in the fields of science and technology and yet may flee in their work.
Since you have started this thread, do you have an idea about how to live without the consolidations of action? Can it be done on an individual basis and if so, do you aim for it? I think it is impossible to progress to a way of living that is based on the denial of the possibility to progress.

Last remark: I think that if you use phrases like "imprinting a human meaning on things", "a truth they are too weak to bear", "faith that the world can be transformed by human will is a denial of their own mortality", "Action gives us consolation for our inexistence" and "philosophys that deny the experience of tragedy", you need to explain much much more if you want people to join the discussion. You can't just talk about 'our inexistance' and assume that people will understand what you mean. Sorry, I had to say it. I greatly enjoy all kinds of philosophical discussions (including this one), but if you drop the heavy words, I think they need far more explanation. Keep up the good work!