Racked ~5.5 gallons of a mead that was based on a dragon fruit wine kit. It was never good and has sat on Xoakers for >1.75 years. It didn't end up over-oaked, which I was surprised about, though there was a ton of oak related dust-sediment at the bottom.
I probably left about 1/4 gallon at the bottom, but I avoided all the oak dust/sediment at the bottom getting racked over.
I then proceeded to bench test acid adjustments. The short story is that all my initial amounts were just too high. In the end I ended up with a .5% cacao nib extract addition and .065% tartaric acid adjustment to get a blasé mead to an OK mead. It's not a huge success but it is no longer a mead that I would relegate to the cheapo-getting-drunk-on category. Maybe it will taste better in another year?
All of the bench tests were focused on maintaining the honey flavor, keeping the fruit and making it more interesting. In the bench testing, I was using 50ml base amounts and adjusting on those. I eventually needed to switch to 100ml base so that I could get more accurate 1/2% additions of the cacoa nib extract.
I will also add that the high accuracy digital scale came in handy today as I really needed that 3 decimal point accuracy so that I could accurately scale up small 100 ml tests to the full carboy without over/under shooting the target. The scaling hit perfectly and matched my final bench test batch.
Every time a batch wasn't good, it was dumped... there were a lot of 50 ml batches that went down the sink as the acid was just too high or I didn't like the specific acid in it. I was bouncing around through tartaric, citric and malic acid. Tartaric is where I found the most pleasant flavor for this specific batch.
Between the spouse and I, we probably went through 1/4 gallon. That ended up OK as my carboy was sitting pretty much at an even 5 gallons after the bench tests. That final 5 gallons was converted out to ML, divided by 100ML to get the amount of parts I was working with and then multiplied out by the batch adjustment values for the full batch additions. That testing added up and I'm feeling it a bit... Not good to do this on a fasting day
Most of my meads don't go through this amount of tweaking, but I really hated this mediocre mead that needed to move into the palatable category. At least when I eventually bottle, it might be worth it... I hope.