I think the hop character at 58-62 is better than that when dry hopping warm. It seems like you’re less likely to get the “sweaty” notes of dry hopping at say 68-72. I haven’t gone much lower than 58 but I might try it soon. You still get all the fruity characteristics. Just less of the weird rotting/overripe stanky character I associate with dry hopping at fermentation temps and especially during active fermentation with a lot of yeast present.
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Just did a amarillo Citra (no flaked) using imperial voyager and my main complaint has been that same overripe taste and aroma and I definitely did my bio hop at ferm temp (73) and then a second dh several weeks later at basement temp (75ish) and it improved things but it’s still there. I had figured it was the a05 since it was my first time using it but this is also the first time i dry hopped that warm. Previous hazys were all using juice at a constant 65.
I had much better results with a Citra Galaxy that was second dry hopped in a keg completely off the yeast after crashing the fermentation keg to 32, so I’m totally on board with your process. I’ve just gotten lazy of late doing ferm and serv in the same keg using a janish diptube filter or cbds