I've grown them all before except Black Moon, that is new to me this year. I only got it because I was running low on Black Beauty (BB) and was curious of trying something similar with the possibility of fewer seeds. Time will tell.
Never got a huge production with any eggplants, with best success coming from plants in grow bags -10 or 15 gal, 2x plants per. Could be because their roots grow warmer than in-ground, supporting your comment about plants requiring heat. It gets hot in the middle of the summer where I am, but the cool spring this year is dragging on -we still have nights in the low 50s. We had HAIL 9 days ago -a rare and freaky storm but still.
Wont be doing any grafting anytime soon, already over committed with the gardening now I'm doing and need to draw a line somewhere