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Look at your TVFool report closely. You do not have line of sight to Mt. Wilson. Click on any of the stations from there to see the path profile. The antenna you have is really a UHF antenna. As you've guessed, you need an antenna with real gain in the VHF-hi band for 7, 9, 11, and 13. The YA-1713 should do nicely.
As far as your UHF reception goes, your results correspond nicely with the TVFool predictions. KTLA is the strongest, followed by KNBC, then KCBS way down the list. The 4228 is pretty good antenna, so simply replacing it with a 91-XG won't make enough difference. Try aiming the 4228 up some, maybe as much as 10 degrees. If that doesn't do the trick, then try moving the antenna up/down a couple feet or try a different mounting location.
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