The problem is 650lbs on a 3ft lever.
flotation brackets have more surface area and act like a giant trim tab on the take off which limits bow rise.
without changing your bracket or notching the transom, here are a few suggestions that will help somewhat.
1. Redistribute weight. (move weight forward, lower the better)
2. Add wedges
3. Use a sternlifting prop like Mirage Plus or Rev4
4. Install a Permatrim or Cobra marine plate
http://cobramarine.com/
https://www.permatrims.com/category_s/63.htm
5. GIANT trim tabs