Currently the first two boss fights don't really prepare us for the final one. The first one takes a bit of effort just because it is the first one. Because the second has the same targets as the first and we have two more weeks to prepare it is much easier. Then in less than a week we have the toughest one for which most of us are not really prepared, even if we have attempted it before.
I would like to suggest that the second boss target be increased from 116m to, say, 200m, and with maybe a few more rewards thrown in to encourage people to try.