Your curls are GORGEOUS...the kind of hair mine wants to be when it grows up.
I wouldn't do anything to alter those curls. BKT is fantastic, though. You have coarse, healthy looking hair, so the relaxation may not be permanent, but be aware that it often is.
I've been using QOD's original formula products for years. I found the Organiq Gold to be less effective on my 3c curls, and I didn't like the smell.
I'm just finishing up my QOD Gold Original formula (no longer available) and will be buying the Kerapremium, which is the original Max formula. If you're concerned about formaldehyde exposure, go with one of the Organiq formulas.
I wear my hair curly, so I can't speak to the success of these products for someone who wants to wear it straight.