I like this! I worry about PAR being uneven and skewing results. The way I see this, I almost wonder if you'd have to use a linear bulb like some HOs to create an even light distribution, and then create a linear rack.
I would also suggest that instead of 5 different types of zooanthids, you increase the quantities of one particular type. For example, this is how I take your current setup:
Polyp type A, B, C, D, and E. We'll have 2 polyp frags of each type, 3 in total, with each placed at zero, 20, and 45 degree inclines. A total of 15 frags.
The problem is that if one frag dies, you lose a data point completely. Another problem is that individual frags may recover at different rates - you can't address that or know if that's evening happening.
The better way would be to use ONE type or maybe TWO types. And to use multiple instances of each setup. So, let's say you use "Eagle Eyes" - you'd want 15 identical frags of that type, and you'd place 5 at zero degress, 5 at 20 degrees and 5 at 45 degrees. You eliminate the differences in genetics, and you increase your data sample at each point for one specific type. If you really wanted to test more corals, great, but make sure you have sizable quantities so you can get meaningful data.