Not familiar with Brewers friend so take this with a grain of salt.
I'll assume that you've had your source water tested and that's where the Source mineral values are coming from. If so you're dealing with quite a bit of bicarbonate and will likely want to dilute your source water some, particularly for lighter colored beers. Your calcium, sulfates, and chlorides are a little low- easy fixes by adding gypsum and calcium chloride.
Burton water is a pretty extreme target- I would be hesitant to make beer with sulfates above 300 Ppm sulfates.
I would recommend bruunwater from Martin B as a good place to start. Great spreadsheet and he helps quite a bit on this forum. Seems like a great guy