I slept in my grand trunk ultralight once pitched tight because I set it up for my kid and switched with her in the middle of the night. This is the only time I've fallen from a hammock. It wasn't so much a fall as a slingshot throw from the hammock. I just offer that as an anecdotal story of how pitching tight with less fabric is somewhat less stable..
Tonight I'm howlin' at a foreign moon, might as well be a junkie's spoon.