That's fine. Taking DXM in the AM would be fine as you would have not eaten while sleeping.
I would chug a glass or two of grapefuit juice as early as possible, can't hurt. Technically would work best before the DXM but at the same time still can have a decent effect.
DXO = strong disassociated type trip, sedating, yeah you feel incredibly messed up but it can feel a bit cold / distant and more so confusion than psychedelia, possibly dysphoric or simply lacking any euphoria, strong body buzz / body load / feeling of detachment or feeling of arms / legs being incredibly far away or different sizes than each other (similar to smoking marijuana after being drunk in my opinion)
DXM = still strong disassociation, stimulating, psychedelia, euphoria, strong music enhancement, visual distortions, moderate body buzz / feeling of detachment
in the end very similar but also noticeably different.... either way it is going to be a strong dissassociative but one if much more warm, glowy, fun, and potentially very introspective and mind manifesting
DXM seems to be strongest at the PCP2, serotonin, and sigma receptors ...and... DXO primarily targets the NMDA receptor (same receptor as alcohol hits)
Edit: to simplify... the more DXM = a more MDMA + PCP type vibe to the trip... more DXO = a more Ketamine type vibe
I supposed it depends on what you like, I always found DXO to feel much less pleasant though