The cable lengths are Ok. If you decide to install a rotor to direct the antenna at the Tv stations to get the strongest signal the extra length from the antenna to the preamp will come in handy. Read and understand this about Real digital Tv channels and Virtual digital Tv channels
http://forum.tvfool.com/showthread.php?t=695 . The channels KSFX FOX 28 and up are the channels to receive , KOZK PBS 23 and below are to weak to receive and are not worth going after. . To improve the signal strength of KSFX and the channels above that go to the >>Start MAPS<< part of tvfool and select current plus pending Tv channels. Raise the antenna height and see if can get KSFX and the channels above KSFX -- NM(dB) signal strength numbers above +10 NM (dB) and this will give you the channels you are missing , K07XL , KSFX FOX 28 , KWBM MyNetwork 31. Raising the antenna height first is the most important.
http://www.3starinc.com/rohn_telescopic_masts.html . This Uncle is showing the antenna height at 15 feet is the antenna still at 15 feet?