Activated charcoal does remove the "tea" color from the water, but you might need to replace it more often than usual.
I slowly lowered
pH in my Angelfish tank by, among other things, filtering through peat fiber and adding peat extract -which also release tannins- got it down from 7.7 to 7.1; since I use (and replace every three weeks) activated charcoal, the water looks crystal clear.
In my Oscar and Severum tank, I have three driftwood that were at least partially cured elsewhere (at one of my favorite
LFS); they have slowly, but steadily, brought pH down from 7.7 to 7.4 in a matter of three months; since I also use activated charcoal that tank is also without the "tea" color (which looks good actually, I guess it's a matter of taste, and some fish love it!).
Pepe
Santo Domingo
PS post some pics of your 55! someone might identify the type of driftwood or even tell if something else is likely contributing to keeping the brownish color in your water... or just because we love pics in fishlore!