Wouldnt Capsaicin itself work against head retention due to its nature?
"Capsaicin is believed to be synthesized in the interlocular septum of chili peppers by addition of a branched-chain fatty acid to vanillylamine; specifically, capsaicin is made from vanillylamine and 8-methyl-6-nonenoyl CoA.[16][17] Biosynthesis depends on the gene AT3, which resides at the pun1 locus, and which encodes a putative acyltransferase.[18]"
Im not a chemist, but it makes some sense to me.
Jeff