If you do elect to replace the FS with a 0.180 inch one and assuming the OEM one is 0.140 inches tall the impact point will drop about 1.6 inches at 7 yards. It sounds from your posts that this won't be enough all by itself.
Have you shot the gun from a pistol rest? That may take some of the uncertainty out of the equation. Also is it grouping well? At 7 yards you should be getting one ragged hole even if it is high. Again the pistol rest can help verify the accuracy.
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