The secret to a good smooth bud is in the dry/cure.
Most hang for a few days then trim and jar for burping but I take up to 5 weeks to get my bud dry enough for jars then am burping for another few weeks to get it dry enough to smoke.
The smells are really nice in the jars. Never grassy smelling and just sweet sweet bud.
I just take the whole plant in it’s pot upstairs to my man cave and do my final trimming as I snip each cola off the plant. Buds go into doubled or tripled paper bags and then down into the cool basement.
For the first week I pour them out into a clean pan. Usually the drip pans for the pots. Gently break up the clumps and let air dry for an hour or so then back into the bags. If you weigh the bags and note the weight loss after 10 days or so I’ll jar them when a bag that started at around 120g wet is only losing a g/day. They can still form a big clump the first few days in the jars but that stops as they get drier.
I have a bunch of plastic tobacco cans that work great for this. Smooth walls all the way up so I can just dump the huge clump out into a pan without digging them out like with mason jars. Once ready to smoke they can go into mason jars for storage as they are all separate and easily pour out.
I never flush but will stop feeding a week or more before chopping in soilless and begin reducing ppm after week 6 or so in DWC but still be around 300ppm at the end.
Flushing agents do sweet fug all so don’t waste money on that shit. And carbs/sugars are for feeding the microherd and don’t really affect the final product other than you may get a better yield when growing in dirt mixes that has a healthy myco population.
Make sure they have lots of sulfur and Mg in late flowering for extra resin production and good old Epsom Salts does that well and cheaply.