The way to reduce calcium is with scant applications of agricultural sulfur, never more than 100 pounds elemental sulfur per acre per year.
Since the most frequently found cation in a soil with excess calcium will be calcium, most of that sulfur will form calcium sulfate (gypsum), which is soluble and leachable.
Solomon, Steve; Reinheimer, Erica (2012-12-04). The Intelligent Gardener: Growing Nutrient Dense Food (p. 165). New Society Publishers. Kindle Edition.
100 pounds/acre = 1.0413g/square foot