Day 25 sounds about right to me. Maybe on the earlier side. I'd say it's more like day 27 from flowering start plus or minus 2 days.
Close enough probably...
I think it is good to be a bit gradual with it.
During week 2 to the end of stretch I'll run a 3-2-3 ratio at about 1.4ec
During week 3 I'll run a little more phosphorus than nitrogen, but basically a 2-2-3 at 1.6ec.
During week 4 that's when I'll start to really push the phosphorus, use a 1-3-2ish ratio, and a 1.8ec.
Every week it is a little more phosphorus and potassium, a little less nitrogen. Week 6 is a 1-6-5 at 1.9ec before the levels are dropped a little for week 7 and by week 8 it is just a little ripe in maybe one feeding to gradually ween the plant off and slowly flush out the elements.
Week 6 is when I'll switch to Ripe. I plan on using around 10ml of that with some hydroplex and Bud Candy, then I'm going to use maybe 3-4ml of Cal-mag to balance out the nitrogen with all those bloom boosters and help out with the low micro elements in the ripe.
Did you know they have a Hydroplex made specifically for soil??? Better concentration and ratio for Coco I think. I found it at hydroasis.com if you wanted to pick up a bottle online.