alright. i have returned with some interesting results.
first of all, i have a recurring problem with the main menu of dragon age inquisition, which is to say: about half of the time, it lags horrendously, to the point where sometimes i have to kill it with task manager. thus, the easiest way for me to get into the game is to click the continue button and go from there -- i'll be the first to admit my computer isn't very powerful, but it runs in game with only a little lag at 30-40 fps. not sure if this is important, but w/e, there it is.
so this time i had to click the continue button. i loaded into my 40+ hr save in the exalted plains, which is where it gets a bit weird. i loaded into what appeared to be an ongoing varric/cassandra conversation about hawke -- and last time i loaded into the exalted plains i ended up in the midst of a dorian/cassandra convo. but continuing on, here are my results; i checked all the entries in the journal off last time i booted the game, not this time.
bear in mind through this whole thing i'm getting pretty regular combat music in fights, and a good amount of combat taunts from my companions.
8:53 - Loaded 40+ hour Exalted Plains save with male Qunari mage Inquisitor in the middle of Varric and Cassandra banter. Cassandra comments on the environment as soon as it's over.
8:54 - Loaded 4+ hour Hinterlands save with a different male Qunari mage Inquisitor.
8:59 - Music plays.
9:00 - Cassandra and Solas banter.
9:01 - Advanced to Inquisiton rank 2 after finishing the "Safeguards Against Looters" quest. Checked the journal, and I didn't get another 'quest completed' popup afterwards.
9:02 - Music plays.
9:04 - Music plays.
9:05 - Cassandra and Solas banter.
9:06 - Finished the "Trouble With Wolves" quest. Checked the journal, it popped up as completed again.
9:08 - Saved.
9:09 - Completed the "Failed to Deliver" quest. No additional completion popup when I checked the journal.
9:10 - Music plays.
9:11 - Cassandra comments "People here should leave the area, it's too dangerous." I found this particularly odd because she said much the same thing before and Varric responded, but this time he didn't.
9:12 - Music plays.
9:14 - Music plays.
9:20 - Music plays. I closed a fade rift at this point, which finished the "Rifts on the Outskirts" quest, and when I checked the journal I didn't get another quest completed popup.
9:23 - Music plays.
9:26 - Music plays.
--
9:27 - Loaded Exalted Plains save into Cassandra and Dorian banter that seemed to be already going by the time it was loaded, just as it had done the last two times. Immediately after, I got Varric and Cassandra banter.
9:28 - Music plays.
9:30 - Music plays.
9:33 - Music plays.
9:36 - Dorian and Cassandra banter. Very clearly a continuation of their banter at 9:27.
9:37 - Traveled to Val Royeaux. Still no music there, unfortunately.
this is going exclusively on the journal fix, and from what i remember before i was getting maybe one banter every two hours on average. this feels a lot more right to me -- i think the fact that i didn't have another banter with solas/cassandra/varric may be because i hadn't even done the main quest you're assigned right before heading into the hinterlands.
so this is two hours it's worked for me. just my two cents for right now 