For 7.5 gallons of RO water I would add more on the order of:
Gypsum, 5 g.
CaCl2, 3 g.
zero lactic acid
zero Epsom Salt
It won't be very pale if you add 1 lb. of 60L caramel malt to it. 10L would likely be a better choice. And perhaps only 0.5 to 0.75 lbs.