Stoney,
Sorry to hear you're having trouble. The only bgl to be added directly to the CFS2/SCENERY folder are the single LOD9 mesh file.
You can add the stock airbase excludes, ONLY IF ADDING THEM THRU CFS2's OWN "ADD SCENERY" DIALOGUE & positioning in the hierarchy as described in the readme doesn't get you the desired results (everyones hardware is different).
The other scenery bgls (Reefs, Rivers, Islands) should be added as discrete scenery layers using the "Add Scenery" tool & arranged as /RIVERS on top of /REEFS on top of /ISLANDS.
I should make this clearer in the Readme. :redf:
Hope this helps