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JakeDawg69 said..
I need to get up on foil easily on my sinker board at around 15 knots but then not get overwhelmed by 25 knot
You probably don't want to hear this - if you want to get up easily in 15kts with a small wing, then don't use a sinker board. You can't have a small board, foil, and wing and expect to get going early. Something has to be upsized.
My 2023 4m Slick works nicely is 16 - 30kt (good at 25, but surviving at 30), but I use a board that is 20L more than my weight.