That's how it's been for me. Foam is much more aggressive than liquid. But the cool part is when it all levels off. But yeah, the hair, at least mine did, goes on a supreme rollercoaster on foam, real lows, followed by supreme highs as things level off..
You're just more often. I use it every single day, twice daily, front and back. I NEVER did that with liquid. And foam has superior delivery method.
But you can't do what I've done unless you keep your head clippered or very, very short.
But hey, good looking shaved or short hair is FAR SUPERIOR to limp, flaying bacon strips kept under a baseball cap.
I will NEVER go back to liquid. I actually have a solid hairline now, aggressive, terminal hairs solidifying in the area that used to be a few millimeters of skin.
The main problem with foam is I think a lot of people think it's Rogaine styling MOUSSE when it's Rogaine VERSAFOAM designed to interact with the skin on your scalp, not your hair.