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@Mu_Mu
Three things I've learned on my tubeless journey:
Some tubeless valves just do not work. Buy good ones and they do. I have VAR tubeless valves (from The Cycle Clinic) on four wheels and they all just work. I have two generic tubeless valves which have never sealed properly in four attempts – I thought it was me being a numpty, but no. They're just shit. Find ones that work then stick with them.
Do not cut an X in the tape - valves are round (ish), so make a round hole. My preferred option is to use a thin screwdriver to make a guide hole and then tap the valve through, or just close the valve on a presta valve and gently tap it through the tape.
Always two wraps of tape. Always. I tend to start wrapping just before the valve and wrap just a bit past the valve on the second way around so that there are three layers of tape above the hole. Could be pointless, but it's always worked for me.