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Yes, as the panel of the DB8E are adjusted away from a common aim point, the net gain decreases. At the same time, the forward beam width increases, which is the same as saying the antenna becomes less directional. In the less directional configuration, you can expect less multipath rejection, a common problem with any combined set of antennas that are aimed in different directions. The DB8E is not unique or magical...
If you take two identical 4-bay panel antennas and combine them properly, they form an 8-bay panel antenna. The DB8E is optimized for covering real UHF channels 14 through 51 so it has a bit better performance than older designs which were intended to cover up to real channel 69.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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