I've moved 3 medals towards my goal of getting all the Combat Challenge Room medals, having gotten 1 more medal in Intensive Treatment Extreme (that's all 3 now), 1 more in Sewer Bat (ditto), and 1 more in Shock & Awe (still 1 more to go there). It seems the trick is to get the most points possible in the first 2 rounds by just going all-out using as many of Batman's 9 combat moves as possible to build up the Variation point multiplier. After the second round, all bets are off so if you're in a good position by then you stand a good chance of getting to that third medal threshold...or at least to the second. It requires a lot of practice and just plain luck, though. I do not understand some of the scores I see on the leaderboard, which far eclipse what you need to get the final medal on each challenge.
I figure if I try to get a few medals knocked out every day or so I'll get them all done eventually without driving me to kill myself from all the repetition. Shock & Awe Extreme seems to be the one everyone hates most.
Oh, and if anyone didn't know we're getting new DLC next week on the 14th. Probably just more Challenge Rooms. Considering none of these DLC Challenge Rooms contribute to either your Medal Count for the Freeflow Trophies or Game Completion, I fail to understand the point of them outside just goofing off (and if I'm going to do that, I'll just replay the game again).