This is what I am currently doing, although my primary temp is closer to 48-50.
You might notice that with temps 52-54 when you add a couple of degrees from the yeast is starts to get a little warm, something to watch out for.
Also, three weeks before d-rest is probably too much. You still want active fermentation to make the d-rest effective. Depends on the yeast and temperatures of course.
For me with a healthy pitch of w34-70 at 50 degrees ambient, I usually go to d-rest in about 7-8 days.
Just some things to consider.
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