Placed Feature Count control

So I started optimizing my pack so each placed feature is only called on once in every biome. But I ran into the problem that when trying to set how frequently the feature spawns, count 3 is too little and count 4 is too much. What could I do to fine tune the spawning of a feature? Here is my current json: { "feature": "limbo:smaller_tree", "placement": [ { "type": "minecraft:count", "count": 3 }, { "type": "minecraft:random_offset", "xz_spread": { "type": "minecraft:weighted_list", "distribution": [ { "weight": 1, "data": { "type": "minecraft:uniform", "min_inclusive": -5, "max_inclusive": 0 } }, { "weight": 1, "data": { "type": "minecraft:uniform", "min_inclusive": 0, "max_inclusive": 5 } }, { "weight": 1, "data": 0 } ] }, "y_spread": 0 }, { "type": "minecraft:heightmap", "heightmap": "MOTION_BLOCKING_NO_LEAVES" }, { "type": "minecraft:biome" }, { "type": "minecraft:block_predicate_filter", "predicate": { "type": "minecraft:all_of", "predicates": [ { "type": "minecraft:matching_blocks", "blocks": "minecraft:air" }, { "type": "minecraft:matching_blocks", "offset": [ 0, -1, 0 ], "blocks": "minecraft:black_concrete_powder" } ] } } ] }