I know nothing much at all about Pairpoint or what they made. But I belive in England those old "lusters" (or "drops"; or "swags") were often made by one or another company and then bought in by others companies to fit to their own products. Even some Irish glass used lustres made in Birmingham, England (according to at least one author on the subject). Therefore, trying to tie in a partcular type of lustre design to a specific company making items that use the lustres may not lead anywhere.
But if Pairpoint made their own lustres, then perhaps specific items could have been adorned with specific lustres?
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Is there a signature on the iridescent "multi color vase"? Sometimes around the bottom edge rather than on the base.