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moocher-
You will always have a gap when the rims starts to curve, this is not where the air seal is made. IF you have a leak, then the valve needs to be tighter pressed into the rim, so that the sealant creates a seal that doesn't move.
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Get a pair of pliers and tighten it as much as you can. Once you have a seal, you can back it off. But remember to do this before you realise on a cold December day where you've barely any feeling left in your fingers and you don't have any pliers with you.
Ask me how I know this.
Glws
andyp
Valve not tight enough.