After months of chiming in on stan's tubeless threads saying how easy I've found it on my Crests with all tyres, I'm now having a total mare with Arches.
I keep getting the air pouring out the valve hole once pressure reaches about 20psi. I've replaced the tape twice, cleaning with IPA to get a good bond, and replaced with the wider tape as advised on the stan's forums. I've bought new valves. I've sealed up the valve with sealant where it joins the rim hole.