On the production of oxidized asphalt

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Here’s the situation: The company I work for faces this problem in the process of producing oxidized blown asphalt. Our company is located in an oil field, and previously we purchased the residue oil needed for asphalt production from refineries. Due to shortages of crude oil, those refineries reduced the amount of oil allocated to our company, putting us on the verge of closure. After much effort, we managed to secure supplies from XA and DL refineries. However, the asphalt produced using these raw materials is extremely brittle, has a high softening point, a low penetration value, and almost no ductility (although it isn’t always like this; sometimes the asphalt produced meets better quality standards). Everyone, let’s figure out how to deal with this situation; after all, there are only these few types of oil available right now! XA oil: Softening point: 87°C; Penetration: 5–10 mm/1/10; Elongation: practically none. DL oil: Softening point: 58°C; Penetration: 28 mm/1/10; Elongation: >100 cm (however, sometimes its specifications are similar to those of XA oil, suggesting that the latter may contain added oil slurry). HS oil: (A type of raw oil used by our factory; it’s just more expensive.) Softening point: 56°C; Penetration: 26 mm/1/10; Elongation: 50–100 cm. Due to its high price, it can only be used as an additive. The process currently used in our factory involves feeding the first two types of oils into an asphalt tower for oxidation; once a certain softening point is reached, HS oil is added to the mixture in a mixing tank, thereby neutralizing the asphalt with a high softening point and low ductility present in the tower with the HS oil. In this way, less HS oil is used, which significantly reduces the associated costs. I would be extremely grateful if fellow sailors could offer some advice.