Note, I'm not in the arena, but do HTH so bear with me

Remember, the range and bearing info is for a point source (my guess would be the tower)
there's a lot of dead space around the tower, which means if you are on target, you're hitting nothing, I usually deviate either range or bearing, and change it every salvo, maybe I'm being lucky, but it gets results.
(Hehe ask the Army how arty works)

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pzvg- "5 years and I still can't shoot"