I forgot to post my results. I ran in a similar way, but packed the column just about full, with a cheesecloth satchel wrapped with herbs from this recipe I found on the homedistiller page on gin:
Quote:Gin botanicals for 20L turbo-sugar wash/ Reflux column
* juniper berry - flat Tbsp
* coriander - flat tsp
* cloves - 1/2 dozen
* anise - 1/2 tsp
* fennell - flat tsp
* cardamom - 1/2 tsp
* lemon - 1" rind
* lime - 1" rind
* cassia / cinnamon stick - 3/4" fragment
My source material was from a turbo sugar wash, I had a bit less than half gallon of 92% abv, which I diluted with reverse osmosis filter water (which they now have instead of distilled at the store by my house) to 30%.
And that's, I think, where my problem was... The turbo sugar "neutral" tasted strongly of sugar. I figured it should clean up running in reflux, and I pulled at 94% for most of the run. At the end, though, the overpowering flavor was still of the sugar wash itself.
The botanicals came through nicely, though I'll probably put them lower down in the column. Someone on the homedistiller forums warned against a cotton bag for safety, concerned that the botanicals would mush up and melt into the column, causing blockage and pressure build up. However, my botanicals were all still quite whole after the several hour run, so I'm not terribly concerned about that.
Despite the herbal flavour, it tasted like sugar, which destroyed it. I should have carbon polished the neutral before running it. Instead, I put it on carbon and shook it every now and then, at 50%, and now most flavor is gone. It's got a bit of juniper, and more importantly, none of the sugar flavor.
I'm going to run it again, but this time I'm going to try macerating. At some point, I'm going to do two equivalent batches to compare flavors.
Rose hips and cucumber, eh? I've been planning that as well, and will be picking me up a bottle of Hendricks for comparison purposes.
As for the cleaning, yeah, I soaked my scrubbers in citric acid, and a good cleaning of the column got all the smell out.