what I am finding now is that I run out of rational upgrades to make while waiting the 24 hours. The only stuff I can do would cost more than I'd get back before my next reset. That second item calms down and the second to last takes over as being best. It looks like they might be thinking about the third being best later since it is the only thing with more than a 2x boost made just for it. It's pretty weak right now though.