Never asked for your advice and reading your post - would never dream of asking you about anything.
The things you talk about have nothing to do with battery life and if you stopped for a second to think about it, you'd have known that. Having 5 Android phones makes you no expert or qualify you to give any advice (obviously). Don't even know why you think the rest of us just crawled from under a rock and this is our first encounter with cellphones.
The myth about Android OS "settling" has been debunked over and over again on this forum alone, do yourself a favor and search about it, maybe you could end up learning something new...
There are basically two reasons why a phone will use more power with a new OS (if screen brightness is equal):
1. The new OS uses the processor/antenna more.
2. Apps are not optimized for the new OS (use more processor time, loops, hang-ups etc).
The myth about Android "settling in a few days" stems from the second case, when app developers publish updates optimizing their apps for the new OS. All of a sudden the battery becomes better, but it has nothing to do with the OS itself.