Thanks for all your input. I was mainly going to try the Valterra Adjustable regulator because it is on sale at CW and I also have a $25 coupon. I know the Watts is probably the best because I've seen it suggested on these forums before.
I've had the cheap ones (both regular and hi-flow) for 25 years. Seems like I've bought a new one practically every year. The hi-flow does give me better showers, but at the cost of more pressure that I don't want coming to the coach.
I do have an Oxygenics shower head. I do change the in-line water filter every so often.
All this said, my shower stream is sufficient, just wanted to see if the adjustable regulator would make it a little better...since I've never tried one in 25 years!