The spray in conditioner by Aphogee - is it protien, or just moisturizing? How often are you using it?
The Olive Oil/cream lotion - is it actually moisturizing your hair? Is it oil based or water based? How often are you using it?
Are you clarifying regularily?
How are you taking the braids down? What are you putting in the braids when you put them up? It sounds like you only leave them in for a week?
I find, personally, that I have the most tangles and knots when my hair isn't moisturized enough. Since most of it is 'put away' I would suggest trying to increase your moisture level, and see if that helps any. (I'm such a broken record when it comes to naturals
)
I cosign with glamazon about being sure that your hair is FULLY detangled and that you are getting all the shed hairs out - if you are detangling, and then braiding it right back up under your sew-in, if it's totally detangled, it shouldn't have a chance to tangle more, as it's restricted in the braids - but if there are 'free' hairs in there, they are going to knot up around the 'restricted' ones...