From the pics it looks like you have the ends (at least the "neck collar" area) drawn up really tight. In my experience this creates a bad gap at the ends that there is no good cure for. For me, I try and get those "seams", if you will, between the head/foot ends of the UQ and the hammock body to be completely flush and only slightly tensioned: keeps gaps to a minimum.
I have an incubator too, good luck!
"...the wolf shows up. Then the entire flock tries desperately to hide behind one lonely sheepdog."
-LTC D. Grossman