FRIZZ, CURLS, WAVES, & MORE FRIZZ - To Keratin, or Not To Keratin?

I have awesome hair days and have I crappy hair days. I have weeks where all I do is wear a bun and weeks when I feel that I look fabulous! My hair feels like the 8th wonder of the world- mysterious and always awing - as in, "Weren't you cooperating 10 minutes ago?" because, eventually, it reverts to a lion's main. Big, wild and unruly. I have spent quite a few years learning to tame it. 

I need to constantly try new things and get down to the next level of hair expertise to make my hair look decent day after day. It's exhausting - and one of the reasons why I decided to try to Brazilian Keratin Blowout 4 years ago. I don't have before pictures, because it's been four years, and who takes pictures of bad hair days?

This is 2 weeks after my first BKB, letting it air dry and then applying the flat iron:

 October 2011

This was after 3 months, letting it air dry:

As you can see, the effects lasted quite a while, about 4 months of frizz free hair.  And as the months crept by my curls kept getting better shape. But I heard about all the formaldehyde in the BKB - the original purple bottle- and decided not to get it done until a safer version became available. About 18+ months (and some hair color) later I had it re done- this time it was a LASIO brand- which apparently only had 0.02% formaldehyde.

June 2012

Unfortunately it washed out rather quickly, and about 2 months later I was back to frizzy hair. I didn't think the $200 (plus tip) price tag was worth it. So I quit the keratin treatment and went naturally curly for a while. This no-poo, co-wash, naturally-curly thing was becoming a trend, and I decided to see what it was all about. A lot of products later, and a lot of time devoted to maintaining the hair and my curls looked great. Some days- like below:

And other days, not so great. Let me think, do I look like a broccoli or cauliflower head?

Or what about when the wind helps you out?

So my hair ends up in a bun:

I don't particularly take pictures of myself when I have bad hair days- so there aren't that many to add to this group, even though they are the majority of my days. If I had to quantify it, I'd say I have about 20% good hair days- and the rest is questionable. I'm tired of long hours taming the curls, or flat iron the frizz away- I want my evenings back, so I'm pulling the plug and getting the keratin treatment done again. I'm hoping to log/document how to care for it, and maintain it (longer), so I can learn from my trials and errors.