Rick:; I grow about 1200 seedlings every year for our Master Gardeners group. Never a problem with damping off or other issues. Steady bottom watering is the key. Nothing gets top watered until well into larger pots and put outdoors.
You really need to consider something like Gardeners Supply APS. There is very little chance of overwatering. I do use a lot of 1020 trays with capillary mats an cell packs as well. Just so everything is evenly moist; the mats do not need to have standing water on them to be effective.
