This is highly anecdotal from a small sample size of my own personal searches, but as a long time Hilton-loyalist and Diamond member it appears to me that Hilton has gotten less dynamic and more fixed with their award chat, and not in a bad way, it almost appears to me they reeled it back a bit. For a while it seemed like dynamic pricing was in full effect any time I searched, but now the awards seem more stable and more reasonably priced than they were for a while.