Fix timing bug in new Blockhead chopping code.
Fix timing bug in new Blockhead chopping code.

Stok/EDMSuite,Stok/EDMSuite,ColdMatter/EDMSuite,jstammers/EDMSuite,ColdMatter/EDMSuite,jstammers/EDMSuite,jstammers/EDMSuite,jstammers/EDMSuite,ColdMatter/EDMSuite,ColdMatter/EDMSuite,jstammers/EDMSuite