Reducing FSRS desired retention 3 months before step

I plan on taking STEP 1 late January. Have been going through anking since April and am now at 17,000 unsuspended with a desired retention of 0.88 and plan on finishing all of BNB and sketchypharm by the time I take STEP.

I'm currently doing 800-1200 reviews a day and it is totally unsustainable. I feel like it sucks up my whole day.

Im thinking about lowering my desired retention to the low 80's to try and get a more reasonable work load back. Was wondering if anyone else uses a lower retention like that and what they think of it. Is that low of a retention good enough for step?