None from me, I like having the plow come down fast anyhow, so I leave the downpressure engaged all the time. As far as I know there is no adjustment on them. Call yourself lucky it's not a Lobo, they have them slowed down to a ridiculous level, I cna go for coffee and have a smoke while the plow is dropping.
I'm with Alan on this one, I haven't had that complaint before so honestly no I don't know either. You can call Steve at the factory at 1-800-662-1453 and ask him, he is in technical service and should know. Sorry I'm blank on this one. None of my manuals show any adjustments on drop speed.