Can you show any detailed measurements of any speakers that can work well for this? Preferably showing pattern across angle and frequency. Most of what you say is really quite vague.None of those speakers have a pattern that can work well for this. The pattern is too wide at mid-high freq, and it does not fall off sharp enough.
A radiation pattern can not be described well just using a radiation angle number, you need to look at how the pattern is across both angle and frequency.