Thickness tapering

Made another 2 bows today and understanding the thickness taper is making me so frustrated as I failed using Dan's method of dividing into a triangle with 3 sections and it didn't really work as I'm pretty sure I shaved it wrong. do I have to make the sides and the belly of the how flat to have a even shave? God I hate working with bamboo and how does this miniature bow have more power than my actual bow ☠️ . Videos are my failed bows and I was and am too tired to figure out how to shave and what I did wrong here. I'm trying to replicate the bow that I bought to no avail and last pic is my next project. Is the thickness taper stuff good here? Thickness taper had me dying frfr 😭😭🙏🙏