1. Make sure the ADV is clean and working properly.
2. I find OEM's are fine for me-others are just to stiff!
3. Might be time to consider a rebuild of the forks.
4. Make sure you use the proper wt./amt. of fork fluid.
When I fist bought my trike, I was considering installing the Progressive springs. My trusted service manager mentioned that they would make for a stiffer (more harsh) ride. Being that comfort is one of my top priorities, I'm staying with the stock suspension which was also checked out and is in perfect condition.