I would appreciate the guidance of all experts regarding the process issues with paste-like PVC

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I have a technical issue related to PVC paste that I would like to consult with you all. Our company uses Hunan powder CPM31; 100 parts of this powder are mixed with 75 parts of DINP, along with a small amount of stabilizers and soybean oil as a viscosity reducer, to create a paste. (In our usual product formulations, the paste has good flowability.) However, the hardness of the products we produce does not meet the customer’s requirements. The desired hardness is achieved by using our existing paste, to which 25–30 parts of PVC powder are added to create another paste; yet this type of paste is very thick and has very poor flowability, which significantly affects production volume. I would like to ask if there are any methods, without increasing costs or even reducing them, that could help achieve the required hardness while minimizing changes in the paste’s flowability? We have also often tried adding 40–60 parts of 400-mesh or 6000-mesh calcium carbonate to 100 parts of the paste; the paste becomes quite thick, but its hardness does not change much. I hope all the teachers can give me plenty of guidance!