I'm having the same problem. I'm Using the Mohu Sky 60 mounted outside. My tv fool report shows abc and cbs the same distance away 17.6 miles and CW at 22.2 miles. I get cbs fine but not abc or The CW. I have the Mohu 15db amp into the splitter about 3-4 feet from antenna. 1st tv is about 10-12 feet away. 2nd tv is about 38-42 feet away for some reason I can't post my tv fool exults here. Should I look into a 20 or 25 db gain amp?
Try taking the amplifier off. Based on the distances you are from the broadcast towers, I wouldn't expect you to need one, unless you have a lot of hills, trees, and tall buildings in the way.
If you can't post the TV Fool, can you look at it again and tell us what the values under the "Signal" section are? The columns are labeled NM(dB), Power (dBm), and Path. Ideally, depending on the tuner and some other factors, your NM(dB) should be between 25 and 70 (plus or minus 5), and your amplification should be used to get you as near as possible to those values.
Also, height tends to be your friend. If it's an outdoor-mounted antenna but it's only 10-12 feet from the TV, I could be wrong but I doubt there's much height to it. If you can get the antenna say, 20-30 feet off the ground and above your roof line, that tends to help things out a lot.