Confirming 1st batch mistakes

[Etowner]

Quick version:
1st batch ever. Of anything. This is mead, 1.085 OG, local non pasturized honey. Bottled spring water, e1118. Nutes and Energizer.
2 weeks in there's no activity LEFT in 3 gallon bucket, gravity is measuring well below 1. SO... I take this as a win and rack into 3 1 gallon glass carboys but I'm a tad short.
2) I harvest, freeze /thaw and boil raspberries with added sugar and add to the low carboy for a secondary.
However, 2 weeks later this (raspberry) one tastes like bitter bandaids.
The other 2 also taste like... they have dropped in quality/ tad off but not as bad. I probably goofed racking somehow.(impatience and oxygen is my guess)- trying to confirm this here.

HOWEVER. Boiling the raspberries into a sweet sugar water also seems like a mistake. I'm not sure. But the off tastes (plural) are probably too much to save without ungodly aging times.
But WHY?
I opted to boil for sanitation reasons.
The trade off seems to be an eventually drinkable product...
Or did I somehow double goof the oxygen on this one?
I have another 9 Gallons in glass/primary working slower (tasting as nice as it can with a yeast colony in it).
All factors the same except these are in glass and approaching the neck/ yet to be racked.
I would like to figure this out before its rack time for that batch. (I plan on splitting this again, apple/raspberry surplus in the yard/freezer)

 

[Mtrhdltd]

Is it possible to post a couple pictures? What did you use for sanitizer? I blame excess starsan for off flavors in one of my spiced meads, but I could be wrong.
One more question, how did you rack? What kind of equipment?

 

[Etowner]

Sodium metabisulphate.
Equipment rinsed with spring water.
There were definitely lazy rinses with tap water whilst measuring gravity/stirring and such. But not the bucket.
3rd photo is the same bucket reset for another project. It was nowhere near full for this batch (was brand new, was soaked in cleaning solution for a day prior, maybe leached?)

 

[Mtrhdltd]

It's hard to tell for sure but it looks like there may be a pelicle forming on a couple of your one gallon carboys. I don't have experience using sodium metabisulfite so I can't say anything there, sorry.I have used campden tablets for must treatment, but not sanitizing. One piece of advice that I have learned the hard way, fill carboys to the neck after primary. All that air is bad and will cause problems like oxidation and infection.

 

[Jag75]

Did you degas and feed your mead? Usually band aid flavor is due to water but you said spring water was used so I'm not sure.