There was this VesperArcade video where it said the (hard?) mode was bugged and didn’t give you any FM even if you beat it fair and square. I believe Capcom still aren’t aware of this fact, because many of the people playing the game gave up on this bullshit mode already. I can confirm IT IS still bugged from my experience. I urge you not to attempt the hard mode until it is patched. You’ll lose your sanity.
Edit: The “FM earned by character” section of Battle Stats shows as though everything is in working order (ie I got the FM and character levels for Ibuki), but that is absolutely not the case. I double checked everything and even if I had miscalculated the FM, my player level should have gone up at least one level (from 730 to 731?), no?
OK then, try this: As Bison, c.MP xx Devil’s Reverse xx c.MP rinse and repeat until the round is over. I’m a Bison main and have used this strategy to beat both hell and extreme (x2) difficulties of survival. The plus frames on Devil’s Reverse should give you enough time to do a c.MP and cancel it into another Devil’s Reverse indefinitely. Keep doing this, even if they’re blocking and you’ll eventually catch them off-guard, taking all the white life accumulated as a bonus.
I got it with Vega. His cheap claw works, especially with the Season 2.5 buff (though it took about 20 Match Finders to cancel out bad rounds and some luck with the drops), but still, done. 42 Laura and 47 Vega were the worst problems. I’d suggest a Defense +3 for Laura if you can get it (I only got a Defense +1, but got an Attack +3 for her), and Vega I’d certainly suggest an Attack +3 (you don’t have time with him doing 15+ hit combos). I guess on some good news is I’m not seeing any ST level cheese like other people say just yet, though the randomness nature of SFV is a problem.
Anyway done. The FM and the trophy got fixed for Season 2.5.