Alright, I don't know if you cleared already by this time but I want to say that no, you don't need to farm more medals. The way I set up my teams ended up with me not getting many medals at all, and even stalling out some later fights, so for the Olga fight I only had 62 medals, which I was able to use on one of the 50x ones (invuln) and then just used the 5x one twice. I also completely flubbed a CS usage earlier which meant I had to use two and only had one for Olga, which I didn't actually use but would've if RNG fucked me (would've just closed app and retried the turn). I was also using mostly absolute dogshit CEs because I just got so bored of scrolling the CE list tbh. Brute force prevails in the end.
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