My shocks were toast when I got the bike:

... so I got Progressive 440s right away, with not-HD springs. I liked them fine,
but when my wife was riding with me, we'd bottom out at bridge expansion
joints and other road bumps, so I got HD springs, its been good ever since.
So... I think if you can't adjust away the bottoming, you probably need different
shocks, don't put up with the bottoming, its too hateful.
They don't make 440s any more, 444s would be good, or, if I were to do it
again, Works Performance

... people like Interstate shocks, but
I used Stanley Steamer's Interstate shocks on a ride when Performance was
fixing a leaker on one of my shocks, and I didn't care much for them. Perhaps
Stanley Steamer had worn them out...
That several people here have had to send their Progressive shocks back to
get a leak fixed shouldn't scare you away from wanting good shocks of some
sort, good suspension makes all the difference, and I know you can roll in
the mountains...
-Mike