I also don't don't really think that reason (1) holds up, considering {wo' DevtaHjaj ghawran} is explicitly stated not to be a toast, in contrast with {wo' ghawran DevtaHjaj}.
It's also worth noting that paq'batlh contains two similar sentences (one of which is repeated three times). I'm generally very suspicious towards paq'batlh, in part because it is meant to be an old and poetic text, but mostly because we know it contains a lot of oddities.
The sentences are listed here:
http://www.klingonwiki.net/En/
PaqbatlhNewRules#A_2._Verb_ 45suffix_7_43_jaj