Anhel, yes, I have a high pH of about 7.8, although the water itself is ultra soft because it goes through a water softener. For the most part, a high pH is okay. Bettas will adjust to it. The only time a high pH might be a problem is with crowntails because the hard water makes the rays curl.
According to my fish profile book, the manmade betta splendens we keep tolerates waters that have from 5-25 degrees hardness and a pH from 6.0-8.0. However, the best hardness and pH is right around the middle, so 10-15 degrees hardness and about 7.5 pH.
This is important though: it's best not to mess with pH using chemicals. When you have to use pH uppers and downers, the pH starts to fluctuate greatly and it's ALWAYS better for a fish to be in a stable pH that is less than ideal than to be in a fluctuating one. Instead, the safest ways to lower pH and hardness are to use Indian Almond leaves in the water, driftwood, or a proprietary blackwater extract. However, if your kH is too low, your pH won't change much anyway.
In your case, Alexandria, your water parameters are fine but if you want to lower the pH I'd suggest a piece of driftwood. It will leach out tannins that will color the water tea-colored but the tannins and humic acids lower the hardness and thus the pH.