Actually, there was a reason why Song Shi was able to cultivate so quickly.
First of all, his Comprehension ability was very strong. The circulation of cultivation techniques was child's play to him. Hence even when he circulated the techniques quickly, it would still be very difficult for him to suffer from Qi Deviation.
Secondly, his physical body and Spiritual strength were now very powerful. He was already close to the Connate Realm. In addition, he had already cultivated the Nine Yang Divine Technique and other cultivation techniques together. Being at the so-called Connate Realm bottleneck level was not a big deal for him anymore.
For example, as Big Smart cultivated a Prajna Art and had limited strength, if he wanted to break through to the Connate realm quickly, he had to rely on medicinal pills.