In the case of the O4S example, sadly not for the most part, the need to align Lucid and Thin Air with each Almagest outweighs the benefits that a 20% reduction there would give, the fight is also pretty awful for lily generation due to how periodic the vast majority of tank damage is. O3S would be better though for sure.
I’d also argue that iLvl 290 is actually rather undergeared at this point. There, little excuse to not be 300+ at this point unless it’s your first level 70 ofc. And getting to 300 is an evening or two’s work at worst.