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As @howard suggests, use another layer of rim tape.
Also invest in a charger pump, it makes life so much easier.
i bought one of the Bontrager TLR charger pumps and have since found life much easier
dancing james
Just spent an unhappy hour trying to install some tubeless. I just can't see how I'm supposed to get the bead to seat.
I'm using S-ones on a set of Alex rims, however when installed with no air in it the tyre sits low in the rim bed with several mm of space between the bead and the internal edge of the rim. I've tried manic pumping and loads of bubbles, but air just flows out freely. I've tried using an inner tube to at least get one side of the tyre seated but as soon as I deflate the inner tube both beads appear to come away from the rim again.
I haven't tried with CO2 or a compressor yet (lost the head of my CO2 pump and will try making a compressor this evening) but even with the increased pressure I can't see how the air won't instantly flow out of all the gaps?