I'm about at the point of encouraging people to ignore the "add this much, to get X change in pH" part of the PoolCalcultor. In my opinion, it causes more trouble than it's worth. It's much better simply to add a basic dose, wait, and the recheck the pH.

Or, if you REALLY just have to single-shot the pH adjustment, you can use the acid or base demand tables in the K2006. I guess, if there's enough demand, we could cobble together a basic borax addition table for that test.

Here's general rule: simple calculated doses to change pH by 0.X pH units are NOT reliable. Just use a basic dose (1/2 box borax; 1/4 gallon of muriatic) on your pool, when you need to make a change. Add, wait, retest -- and repeat if needed!

But, in this case, adding too much borax is not bad. Having a 50+ ppm borates residual will make your pool somewhat more resistant to algae, and your water a bit more 'sparkle-y'. A LOT of people do this deliberately.

Do you have a Sams Club in your area? If you do, you might want to make a run, and pick up 50# of "PoolBrand Chlorinating Granules" for $105. (That's what it costs, in Chattanooga, anyhow.) Using it will
1. raise your chlorine
2. raise your stabilizer
3. lower your pH.

You probably won't be want to use it exclusively -- if you do, and use it all up this season, you'll end up with a CYA level near 130 ppm. You can do that, but you have to make some modifications. But, it would get you into range very quickly right now, and make the next month, very easy. After that, you'll have to switch to using bleach or cal hypo some of the time, instead of just dichlor.

Do NOT buy dichlor from Walmart or Costco -- they've 'gone over to the dark side' and are selling hodge-podge dichlor + mystery goo blends. Locations like Lowes, Home Depot or Ace Hardware may have the plain dichlor OR they may have the pool version of chemical hobo soup. If you try to buy there, may sure you can read the chemical labels correctly. Otherwise, if you want a smaller quantity, you can get it from Amazon:
Kem-Tek Dichlor 12lbs
Kem-Tek Dichlor 22.5lbs
If you buy the 12lb size, you'll have 36 ppm stabilizer in your pool when it's gone. With the 22lb size, you'll have about 66 ppm.