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AUS220 said..
with the smik board, I have gone in 15kts and 20kts. It feels like I can't get the board to foiling speed, even though I have an insane amount of pressure on the wing, it doesn't translate to speed or lift.
( I have a SMIK 90 liter, 5'0 board, an old slingshot alloy kit- manta front wing, a 4m wing and I weigh 71kg)
15 knots may be a bit borderline for a beginner your weight with a 4.0, but 20 knots should be plenty. So most likely, the trim is wrong, with the foil too far back. Chances are that you have to move the foil all the way to the front of the track. Here's a diagram with a current Smik board and a Manta 84 foil to illustrate:

You want to stand so that your back foot is behind the front wing, and the front foot in front of it, at about the same distance. The gree box shows where your feet would be on the board. Chances are that your foil is further back, and that you are standing further forward. That prevents the foil from ever creating enough lift.
For your setup, also check the distance between the mast and the back edge of the front wing. Many Slingshot fuselages allow different positions (A, B, and C). In the A position, the front wing is right on top of the mast. That works only for kiting. The B position is shown, and has a few centimeters of space. The C position moves the front wing even further forward. If your fuselage has all three position options, you could try the C position, too.