Ok I am going to weigh in on this. Because there are times when I feel like I got more power then I should form an upgrade and less power then I think I should and I am on server 1. It does seem odd to me as well. There is the glitch with upgrading sets giving you a 6 pc bonus instead of a 5 pc. But refreshes fix that. I always refresh after a power upgrade to see if I got the right power. Sometimes it goes down, but always an improvement.

There are some things that give you more power then other things. Anything that adds HP seems to give you the most power so upgrading to a 5pc set or just upgrading a relic or vitality seems to give the largest power increases. Magic defense seems to give the least.

Formations can change power alot

But Old48 and Duec are not idiots and the only explanation for what old48 described is that the original 6.7m power was incorrect and was showing more then he really had. SO it may have been a glitch of some sort that let him believe he had 6.7m power to start the day. If this is the case SERIOUSLY FIX THE POWER DISPLAY BUGS. There has to be something to it with all the posts on forums. Please start taking screenshots and submitting tickets.