Is there a preferred way of using Rogaine & dexpanthenol for maximum results?

I have been using Rogaine since early 90's with so/so results.  I apply mornings & evenings to crown area.  In the past I've used a 5% version which aggravated my scalp, since I've switched back to 2?% with no aggravation to skin

Recently I heard about the benefits of using dexpanthenol (brand name pantherm?) to condition the scalp prior to Rogaine application.  Effective or not?  Also I've read that this increaed effectiveness will allow for only one a day application.

Thanks in advance, I appreciate your forum as a way of getting accurate information, vs. on-line 'urban myth'

Terry