Sheng puer tastes very mild after a few months?

Hello, I'm trying to figure out why my teas aren't as fragrant and strong as when I first got them. I have stored my vibe, honeybomb, and snoozefest teas together in a plastic tupperware along with a few samples. I have them stored them with a 65% boveda pack with a stable temperature around 70-75F in a dark area. I received them around the same time in December. I brew my tea gongfu style, and I use 6-8 grams of leaf for 100ml. I heat my water to 95C and wash my tea for 10 seconds, starting with brews of 10 seconds with 5 second increments. While I know these teas are known for being more smooth, they don't taste nor smell as lively as they did the first few weeks. There are still scents coming from the teas, just not as strong as before. Is this just the tea mellowing out? Or is this because I'm storing them all together? There are no personal issues on my end as well as I don't smoke or have any illnesses affecting my taste.