It didn't really make a lot of sense to me how everyone was suddenly so powerful during the apocalypse in 1963. The season went on to show where they had been and what they had been up to during their individual lives in the 1960s, and none of it involved training to improve their powers. And they never reconnected until after Five arrived, so they wouldn't have had any opportunity to work together before then, either. Just feels like they did that scene because it would look cool but didn't really think it through.
Maybe Hazel did not just take Five backwards just a few days but a little sideways as well ie the timeline in which they were so powerful in was a different timeline from the one we saw them in for most of the season? Maybe in the ‘powerful timeline’ they had all arrived together (minus Five) and had a year or together to master the powers?
Another possibility is the very act of travelling through time awakened some of their previously latent powers.
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