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Yeah it's hard to specify whether it was the boiler ring itself that needed tightening, or the bolts that attach the whole base plate to the boiler ring.
When you mentioned the element seal, I thought you were talking about the sealant applied under the little white collars here:
But I think you were actually talking about the o-ring you can see in this picture:
Which I think is a likely candidate.
Are you certain? I bought one with enough of a leak that rust had pitted the entire underside. I replaced the boiler gasket, which had hardened substantially and needed chiselling off, and there's no leaks anymore.
Edit: this was four years ago so could be misremembering but, like @mmccarthy, I don't remember touching pstat