SoT IS A LIE?

Hello XDAres

Read this as a foreword - it's not a must

I've been using my OnePlus One for about a year, and at first the battery was great, but after upgrading to CM12S it seemd like it got much worse. this case wasn't only for me ofcourse.. many other users of CM12s and basically any Lollipop device had complained about a decreased battery life. their evidence to that was their SoT- which used to be (and I'm talking about the majority) around 4-5 hrs back at KitKat days, and had dropped down to 3-4 once they had gotten the 5.0-5.1.1 Updates.
that was caused by a number of things- among of them was the Google Services Wake bug etc.

Now to the point-

My OPO used to get 4.5+ SoT ( Screen on Time) back @ Kitkat days. since the upgrade to LP it went down to 3-4 max.
And then I've tried something-

I simply changed the settings of display, to turn off the display after 30 minutes of screen idle (it was 15 seconds before).

And the results?





The suggested conclusion is- SoT is a lie.
If prior to the changes I've made on the display settings, I'd get ~15% @ the end of the day ( say 11PM/23:00 ) and a 3.5hrs SoT, I can now get to ~5% at the end of the day ( again 11PM/23:00 ) by simply raising those values. does it mean that I've used the phone more? well, no, it simply tells us that SoT isn't that trustworthy as we thought.

Opinions?