There's heat stress and then there's light burn. They're two different conditions. For example, in the winter the air our fans bring in from outside cools the lamps to the point that the glass is freezing cold. Even though they aren't making the area warmer, if the 430w bulbs get closer than about 10" the tops of the plants, they'll cause light burn. Fluorescents can actually touch the leaves without causing light burn but can still cause heat stress. Allowing at least an inch between the plants and the bulbs with good airflow is enough to prevent heat problems with most CFL's.
Any stress on the plant during flowering can theoretically trigger hermaphroditism. The more stable the strain, the healthier the seeds and the less stress the plant encounters, the less chance it will hermie. With good genetics, hermaphroditism is rare, even when there's stress.
Never top a plant during flowering. Trimming of any sort in that stage is best avoided.
You seem pretty worried about hermaphroditism. Have you had problems with it before? If so, perhaps you should try different genetics. There are other problems these stresses can cause that are as bad or worse. Too much stress during flowering can cause a plant to stall out and temporarily stop growing altogether or even kill it.
