The NT journal Neotestamentica has a new article on Hebrews:
Heath, David M. “The Problem of Peak in Hebrews.” Neotestamentica
48.2 (2014): 405–16.
"Scholars use various terms for the phenomenon of discourse peak. Only in
the last forty years have some scholars suggested different types of
peak. This study explores the application of multiple types of peak in
the book of Hebrews. The problem of peak in Hebrews is evident by the
diverse assertions concerning linguistic peaks by Neeley (1987), Guthrie
(1994), and Westfall (2005) and the discrepancies of these peaks with
the chiastic centre in Hebrews 8 as asserted by Vaganay (1940), Vanhoye
(1977, 1989), Neeley (1987, 63), Gelardini (2009) and Heath (2011).
Until more refinement of the notion of discourse peak and uniformity of
terms emerges, it may be helpful to analyse the peaks of biblical texts
in light of their natures (thematic peak, climax, and apex)."