Never rely soley on prop charts or other's advice when it comes to props. It only costs $1.83 to try a new size.
.45s were put on this earth as a replacement for what used to be the standard sport engine, the .40.
Sport .40s did most of their best work with 10x4, 10x5 and 10x6 props...11x4 props and up usually gave diminishing returns when comparing vertical pull. Along came the .45s and their ability to turn 11 inch props as well as a .40 could turn 10 inch props gave the average sport flyer a new combo that could put some marginally heavy planes "over the top" as far as vertical performance and brute force aerobatics are concerned.