Huh.... that sure is interesting toothpastedog. Lol I got a kick out of your sn when I was tripping last night. What does that mean exactly? Anyways, last time I took 40 or 60mgs of lope I did not shit for a week! Although it did take me out of w/ds completely, it wasn't worth the painful constipation. Some say that lope does not constipate them anymore than any other opiate, and that used to be the case for me, but not anymore. Also, subutex never constipated me until recently either, maybe I'm just getting old (I'm 23 and I don't feel 60, but I don't feel 16 either...injecting pills is probably responsible for most of that...) Afa DXM goes, well I can't seem to figure this stuff out. 75mgs doesn't do a damn thing, but say 90 or 105 and I'm getting a wierd glowing euphoria and out of w/d! And of course if I take like 600 mgs then I'll be on the god damn moon for 8 hours... but that's a different story. I'm starting a DXM maintance regime to control my subutex tolerance and stop injecting my pills. DXM seems to be helping take my mind off the needle and keep my tolerance low, thus helping me not use the needle.

Yes, the un... Okay, so years and years ago (I be 24 these days) when I was first setting up a yahoo email account I've long since forgotten the password to, I wanted to come up with a un I'd forget and that might be a little creative. At the time I was eating a hotdog. Next to my comp on the desk was some toothpaste I'd just purchased (when I also purchased said weener). And voilà, toothpasedog was born.
Everyone is different, so if lope makes you SO consitpated forget about it for now. Given what you've written about DXM (which was almost my initial reaction to it when I tried it semi recently to help with w/d), I'd say go with day. Start on the first/second plateau with about 230mg (the amount in the generic DM bottles I see at my drugstore, but anything from 180-300 will keep you in this range), and if you feel like it experiment with going higher (like 460 and then 690, as you can read I did in that link).
Seriously, I used to HATE DXM. HATE HATE HATE HATE. A long time ago I used it precisely because it would disorient me, and totally made me forget the w/d. Low and behold, as the above post points out, DXM actually has a LOT of properties that make it ideal for treating ACUTE w/d (the first one and a half-three weeks in give or take). Of course, that is assuming you've become acclimated and do not mind it's dissociative effect.
I must admit, sometimes now I prefer to focus on the dissociation, and potentiate it with Tagamet (haha, awesome OTC drug, which potentiates both opioids and NDMA receptor antagonists

). Having the racetam/Piracetam to minimize the dissosiative "Woah-I-Really-Fucked-Up" feeling when taking it day after day, as that link details, surely was a god send though. I don't think I could manage taking it daily without a racetam.
In a nutshell, everyone's different, yes... But, I honestly don't think I'd be sober today with out the DXM (and piracetam). Take that for whatever you will, as I know a LOT of people do not like DXM (like 2/3 of the people who try it according to W.W.'s manual), but I'm inclined to say it pretty much saved my life. This time

...
Oh yes, and while I totally understand the desire, taking DXM @ 230mg for four to six days surely is safer than I.V.ing subutex. Unless you are really rigorous with your procedure, use a barrel filter, etc. etc. But even then I'm very hesitant to say it's any better than DXM.
Let us know how things work out for you! Hope this finds you well!!!