Great question. So many hobbyists get this wrong and cause more serious problems.
The 2 part BIonic product is designed to maintain the correct calcium and alkalinity levels, for aquariums which are already correct. Adding BIonic to this aquarium will not correct the problem. See this series of articles by Randy Holmes Farley as a refernce: Chemistry and the Aquarium
. You really need to read everything by Farley you can get your hands on in reference to alkalinity to develop a deep understanding of what causes these issues. Fortunately, you don't have to be a chemist, you just have to know how to react to different test results.
In your particular case, adding a buffer will temporarily boost alkalinity, but will not be effective in maintaining the alkalinity levels. You have adequate calcium, but have a shortage in other areas that you are not testing. This is most likely magnesium, which you can test for and you can add directly to your aquarium. Many reefers test and dose magensium religously, just like they do calcium. My personal preference is to do a water change when I get low alkalnity and high calcium. The water change helps to replenish magensium, as well as other buffering ions, most notably borate.
In your particular case your DKH is very low. I would suggest doing a 10 gallon water change, which is more than I normally like to do in a single day. If it were me, I would do 5 gallons in the morning and then another 5 gallons later that day, because I think the livestock is less stressed with smaller changes. When you do the water change, also add a buffer. I recommend Kent Marine Super Buffer DKH. Give it a couple of days and retest. You should see an improvement in alkalinity. If the alkalinity is still low and calcium high, do another water change, adding buffer, waiting two days, and retest. Continue in this format until the alkalinity is between 8 to 12 DKH and the calcium is >420 ppm. When both readings are normal, you can go back to your daily additions of BIonic, at the proper dose to MAINTAIN the leves within this range.
Hope this helps.