Placed Feature Problem

So basically Im trying to continue my custom dimension datapack and one error Im noticing is with the features. Whenever I try making a forest in specific- the features are sometimes placed on top of each other 💀 Like a tree on top of another tree 
Now the current tags im using to define my placed feature are rarity_filter, random_offset and in_square along with heightmap of WORLD_SURFACE_WG 😭 Pretty basic since most my focus was towards the structures but now this bug keeps on ruining everything so yeah. 
How exactly do I make the features NOT spawn on TOP of each other. I tried changing the heightmap to ocean floor, ocean_floor_wg, and also world_surface but no difference.