Roomie the drying and curing is the key to good flavor and smell more so then the flushing IMHO. If you flushed for a week last time I don't think you'll notice any more difference by flushing longer. If you want to try to improve the flush you could grab a bottle of clearex, final flush or a similar product designed to remove any remaining salts and clean things out. I generally think the only time you need to flush is if you've over fed the plants. Do you remember how your last bud burned, did it leave nice white ash, or burn into black chunks. This can give you an idea if there was alot of nutrient residue from my understanding. If it burned pretty clean I would deffinitely focus on the drying and during to get the flavor and smell where you want.
How did you dry, trim, and cure it last time? Over the years I've tried a bunch of different stuff and I've had the best flavor when I dried the plants whole and trimmed them after drying, then began the curing process. This allows a nice slow dry, and gives the terpines a chance to mature into their full potential.