Liu Bei's side indeed has quite a few experts of Inner Qi Manifestation Rank, and Hua Tuo's treatment here is indeed exceptionally high. However, to say that top generals like Guan Yu and Zhao Yun would coordinate in experiments, one, there's not that much time, and two, Hua Tuo doesn't dare to openly admit it!
Occasionally, taking a tube of blood for research is still possible, but the issue is that this holds no real significance for Hua Tuo's overall research.
Apart from discovering through a microscope that Inner Qi Manifestation's cellular endurance is extraordinarily high and the activity is very high, no practically meaningful research results have been derived. So, Hua Tuo has great interest in the project of studying the super speed recovery of Inner Qi Manifestation, but up till now, there are no actual results.
