Propagation: Flower seeds and germination "situation", 4 by BigZig

BigZig wrote:
My experience with growing flowers from seed started........5 days ago. I'm in zone 6, and attempting to grow Petunia, Lobelia, Begonia, Calibrachoa, Pansies, Nasturtium, Impatients, Phlox, and Snapdragons from seed. I'm using 72 pot Jiffy seed starting flats with heating mats and UV bulbs overhead.
All the seed packets (Burpee mail order) list anywhere from 10-14 week germination time frames (with the exception of the Snapdragons which were 8-10 days. Seeds were sow 2-3 in a pot with Jiffy seed starting wafers for substrate. The flats were seeded within an hour of being prepped with the wafers this past Saturday. All seeds were placed as per packet instructions; some on top of the soil, some lightly pressed in and some 1/8" deep and covered. Light is being applied for 12 hours a day which brings the soil temperature to 76-78 degrees. When the lights are off, the soil will cool to 71.9 - 72.8 degrees.
Imagine my surprise when on the morning of day 4, I had germination of multiple types of seed. This evening, day 5 I have germination of everything except:
One Begonia flavor, one Calibrachoa flavor, and two Pansy flavors.
Twelve other types of the same flower seed have all sprouted.

My question is, should I count my blessings and concentrate on keeping the damping under control next, or have I done something wrong that has accelerated the germination of these seeds?