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A few wraps as in 4-5 wraps of ptfe tape isn't enough at all, x10 should be enough, Purefreedom use a Fibre Ptfe tape this is far better but not too easy to get hold off
As in ruining your van, if you have plywood down it's best to have that ripped out as moisture and water has the potential to get everywhere and anywhere and black mould will grow on the plyboard
You really need to dry the area round the tap and then watch to see where the leak is coming from. Until you find the source you will just be jumping from one idea to another and maybe causing yourself more issues. It could even be the tap part of the valve that's leaking and no amount of ptfe will fix that.
Gas PTFE taps is thicker than normal plumbing so needs less turns to help seal.