dextrose is great, but for after you w/o. i guess it doesn't hurt to use it like you are, i t will certainly rellace the carbs you've burned up doing chest, assuming your intensity level is high. dextrose is rapidly absorbed by the body causing an inslin spike which is great right after you w/o. i would also invest in another power though, just regular whey for pre w/o and other times during the day. another trick is to drink a shake in the middle of the night. have one mixed and sitting in the fridge ready to go. i only drink one if i get up to pee, others set an alarm clock, but i think that's unnecessary, but thats just my opinion.
post your w/o routine
no weight is needed