I'm confused. The writeup states this element is 4600W @220V which is 19A.
https://www.norcalbrewingsolutions.com/store/Heating-Element-120-or-240-Volt.html
1. I shoot for this: Ca 50, Mg 7, Na 5, SO2 75, Cl 60, HCO3 0
2. Been doing 75 min boil.
3. Doesn't matter if you fly or batch sparge. Mash temps are the same. See OP. If 1-step is desired go with 150F for 90 min.
I still use the original recipe. Change up the hops with what I have. Been using WY3787 the last few years. Kinda like it better. I tap near XMAS and is a fine beer in Jan/Feb!