Hi docwine
I remember not too long ago when I confused and befuddled myself trying to figure out the ins and outs of PH. It's really hard to talk about because the words just seem so counter indicative. OK. your wine is now at 3.8. It would be much better if it were at say 3.4. So to lower the PH down to 3.4 you need to add acid blend. The more acid blend you add, the lower the number goes. But I would really aim for 3.4.
Hope this helps. Once I kept adding acid blend trying to get the number to go higher. Needless to say I had to blend that batch with a couple others as it was the only way to save it since the PH went way too low.
Pam in cinti