No, foliar feeding is not a substitute for fixing your ph problem.

It's like wrapping your ankle with an Ace bandage, because you have a headache. In the end, you still have a headache, and now your ankle is sore.

Typical of life...covering-up a problem doesn't solve the problem.

I'm guessing it's a water ph thing? What is your water source, (well water, city tap, store-bought...)
What ferts and nutes do you use? What kind of soil?

General Hydroponics makes a good "ph Down" product for adjusting the the high ph in water. It's a weak phosphoric acid, and works great. 1/4 tsp per gallon, adjusts my 8.1 water down to 7 even. (an extra drop or two beyond that, puts it at 6.5) One gallon has lasted me almost two years so far.