Tons of stuff on YouTube, UFC fight pass has all the past prideFC fights. There's a decent number of fixed pride fights so keep that in mind. Damn near every prideFC fighter has been juiced forever, maybe not intelligently but enhanced none the less. The age of UFC trt was roughly 2010-2014 till they banned it. You can see TRT vitor before and after, look up Ubereem vs Overeem. If you watch fights in that era there's a ton of "moderate" test usage with gh I'm guessing. There's an argument that people like Jon Jones who constantly got popped were never really off even after his DC fights. Mcgregor is juiced now. I doubt you will find any fighter clearly explaining their use and how it affected performance at the time. My best guess is to go by if they failed the drug test and physique.