I have had the same problem that many of you have described here in this forum- that of the textures "blending" on the taxiway and ramp areas. The runway seems fine though. After nearly 3 hrs trying to find a fix, I have narrowed it down to the MegaScenery SOCAL Objects in the scenery library. If you simply uncheck the SOCAL objects in the scenery library- your texture blending will go away. I have tested this and re-tested it prior to this post. I have FS Terrain, Mega Scenery SOCAL V2, and Fly Tampa KSAN installed and by unchecking the SOCAL Objects in the scenery library I no longer have texture blending on the ramp or taxiway areas. I have tried moving the SOCAL Objects all the way to the bottom of the list, but still have the problem- I will continue to use the scenery with it unchecked.
Also, I am not a fan of the I5 bridge. If you feel the same way, you can remove the bridge by simply removing the i5.bgl (bridge itself) and the i5ani.bgl (animated traffic) from the flytampa/ksan/scenery folder.
I hope this post helps many of you with your texture problem.