It'd be nice if you could get a minimum of 400 mg magnesium. So that would mean at least another 150 mg added to your drops.
You may be okay with the amount of chloride in the drops plus the chloride in the salt you're using. I can get foot cramps when my chloride has gotten too high -- have had more trouble with this than the sodium in salt. But that may just be me.
The boron is actually a small amount, just 0.37 mg. Consider getting, if possible, a high-grade borax, and use 1/8-1/4 teaspoon in your water. Try to drink as many ounces of water as half your body weight in pounds. 160 pounds = 80 oz water minimum
You're doing well! You'll get more information once you get into your routine and your body gives you feedback. Let us know how you do!