Some suggestions & questions:
Why are you adding dextrose?
The beer child is just reaching maturity and you want to rip it away from its yeast mother already? Have some compassion. Let her live with her parents a little longer before you send her into the real world. Aka- don't rack yet, esp if you have some off flavor you want to clear up.
Dry hop with AT LEAST 1oz, preferably more.
Up Next: Coffee Stouts, Brett Beers, More Sours, Quad, Brown
Bottled: The Queenella Dugbe RIS, Avlan RIS,