Yeah, glue or some thick grease to keep the O-rings in place while you bolt the outer half on. The stupid O-rings are the worst part of H1's for sure. Are you using cut down mag-inserts, or PVC's? If PVC's, are you sure they are the correct size for the tire you are using? When I went from 38.5's to the 44's boggers (and on a side note, this would have been the same for my now 42" PBR's too) I wasn't thinking and tried to mount a 44 using the same PVC's I was using for the 38.5's and there was no way it was going on. Found out that I had to cut down my PVC's as obviously the bead was much larger/thicker on the 44's then the 38.5's. Once I cut them down to correct size, they all went on as they should. Just something to think about is all.
I have one of my 42" PBR's that leaks just slightly. But it'll hold air for probably 2 or 3 weeks just sitting in my shop, and at that point I notice it's just starting to sag a bit, so I throw some more air in it. Not nearly enough leakage for me to warrant breaking the rim down to re-seal it again. I know it's probably my O-ring got folded over a tiny bit or something.