HA considers the tongue weight it can contain as 1400# on the TT itself. Their literature doesn't say "up to 1400# tongue weight minus the weight of the HA itself". In fact, now that I think about it, I don't recall any hitch manufacturers stating "XXXX tongue weight minus the weight of the hitch".
Your TV cares less whether it it is tongue weight from the TT, or hitch weight from the HA. It is considered weight for all intents and purposes.
[soapbox]Come on, guys, must we nit pic every single post on rv.net to death? This is why people come here and post once, then never post again. Or update their original posts. I'm actually surprised the OP came back, as he has been quite beat to death on his last couple of posts. He is trying to learn, and is doing quite well, IMO. [/soapbox]
To the OP - as others have said, you can't adjust a hitch to make up for a crappy road. Adjusting speed is about all you can do. Sometimes an oscillation effect occurs due to wheelbase and expansion joints. New shocks may slow down those oscillations, then again they may make it worse. Adjusting speed is the easiest way to control them, IMO.
YMMV
