whenever i do this combo, i like to do the LSA near the peak of the DXM trip so that i come up on the LSA as i come down from the DXM. this can get pretty wonky and delerious though.
the other way around also works well and seems to keep things a little more sane, though still very enjoyable.
when i do both at the same time, sometimes the trips are duds (with full doses of each, like they're cancelling each other out), and sometimes they're epic as fuck. i have no clue what causes the varied reactions.
then again, thats the way i do it. and i use much larger doses than i would recommend to anyone else who is first starting out in this realm.
judging from your doses, you're looking for a DXM trip with a bit of HBWR flavor, eh? both at the same time is probably good then. i'm also guessing that you're a lot more familiar with DXM than with HBWR. in that case, i'd recommend doing the HBWR about two or three hours before the DXM so you can tune into the LSA frequency before delving into your dissociation.