Hello! We are new to chickens and incubation. We are wanting to incubate the few eggs we've collected. We've made a small incubator out of a Styrofoam cooler (small). In it we have - from bottom up - a wet paper towel, a toaster oven rack, thermometer that measures humidity as well as heat, small bottle of water, large rock, sponges, and a 10 w bulb. We've finally gotten the temp to hit about 97 (which we need it to reach 99-100, right?) and the humidity about 67 (currently). We need those few extra degrees and im looking for the best solid item, safe for an incubator to retain heat. We do not want to spend any more money. I've just put a small ball of aluminum foil in as well, will this help? Any suggestions??