My favorite coil for the Kayfun V5 (and btw. also for the KM3 and K4) is a simple spaced Kanthal 0,35mm (AWG 27) 7x coil with a diameter of 2,5mm at ~ 1 ohm.
1. Wind about 10 wraps around a 2,5mm pin
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2. Pull on both ends to space the coil
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3. Pull off wraps on both ends to have 7 wraps left
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4. Attach the coil between notch and Screw
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5. Center the coil over the air hole with a distance of 1-2 mm
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6. Insert the cotton, leaving ~ 1,5 cm on both sides
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7. Bend the cotton-ends down and place them in the pouches
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8. Put some drops of liquid on the wick and make a test
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This gives me a good tasting vape at 17-20 W