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Yeah, chasing 1.6 on your shallower stops is impossible. Super wasteful too. Since that's where most of your deco is, an OC diver has an advantage there since they can hit 1.6 on their 20ft stop and CCR will need to settle for 1.4. But the CCR diver can even it out on intermediate stops where the OC diver is working with a less optimal PO2. The real magic is on multilevel stuff. CCR will prevent a lot of deco from accumulating compared to OC by maintaining an ideal PO2 when away from the MOD. I did a 3 hour swim at Madison with some buddies on OC. They used 32% and ended up with 15 min of O2 time. I had no deco.
If you're doing multi-level or weird depth cave dives, particularly on a DPV or in high flow, you can also goose the ppO2's on the way out to start clearing deco earlier. I will typically go up to about 1.4 on the exit side if I'm not kicking and that helps to clear some of the deco a bit earlier.