the first thing to do is to read the output of
# 66-intree -o name,enabled
the boot tree should
not be enabled but all trees that you want to start at boot time need to be enabled.
So, enable a tree
# 66-tree -E <treename>
Take care of the order of the tree
# 66-intree -o name,enabled,start
reorganize it if you need
# 66-tree -S <tree_to_start_before_treename> <treename>
tricks, if you need to mark a tree as the first tree to start do
# 66-tree -S <same_treename> <same_treename>