Olymp Trade — Gimme an explanation

The platform, before the recent updated, started to shine even brighter, not going to lie! I can't call myself a rookie trader, seriously. But it's a nonsense to call myself a seasoned trader because I still don't have enough skills and MONEY to prove that I am a pro, huh.
Anyway, I trade on the real account, of course, and got a question, maybe even a whole complaint as one thing remains really unclear to me.
It's about fixed time trading mode, actually. IDK why the profitability rate is so low for me and I don't really like it. 30% of return for some exotic pairs, Ether has even smaller % of returns and it's...disappointing, guys, a bit. I am not an active user of FTT, but sometimes siwtch to the mode to make a couple of deals and run away with cash :)) So wanna find some explanation!