Welcome to the Jayco forums
Just a couple of questions that may help us with your issue:
* I assume that you have a standard WDH (not a Reese Dual Cam) ?
* What brand/model WDH do you have (Reese, etc.) ?
* What are the spring bars rated at (800lbs, 1,000lbs, etc.) ?
* Do you have "round" or "trunnion" style spring bars ?
* Can you post a side view pic of your WDH with the TV/TT hitched ?
Based on your posted information thus far, I can offer the following:
You stated that you are "presently at 8 chain links" and that the spring "bars are also pointed upwards"........, this implies to me that you are counting the chain links that are hanging loose
from the snap-up bracket, not under tension
With a standard WDH you want to achieve at least 5 chain links under tension
(not hanging loose). Less than 5 chain links under tension may cause the WDH to bind in tight TV turns.
Your correct that ideally you want the round or trunnion style spring bars parallel to the TT frame when engaged. The round spring bars can have a "slight" downward angle, but the trunnion style spring bars can have a more aggressive downward angle and be just fine.
The 2006 29FBS
has a dry tongue weight of 740lbs, UVW 6,725lbs, and a GVWR 8,750lbs. Also, the 29FBS has an overall length of 32'-5".
When sizing and adjusting a WDH it's best to work with "loaded" TV/TT weights. Our loading habits very.....; so assuming that your loaded TT weight is 7,600lbs you would want a loaded TT tongue weight of 13% to 15% of the TT weight = 988lbs to 1,140lbs. Based on just this assumption the WDH should be sized/rated at 1,000lbs minimum, but 1,200lbs would be ideal.
Your TV's front/rear suspension measurements with TV unhitched and TV/TT hitched with spring bars engaged look fine.., but I do question whether the WDH is adjusted correctly in achieving these dimensions.
Yes, most WDH manufactures recommend using two friction sway control bars on TT's longer than 25ft.
Reese Trunnion Spring Bar style WDH install/adjustment: http://www.reeseprod.com/content/dow...ion/N66022.pdf
Reese Round Spring Bar style WDH install/adjusment: http://www.reeseprod.com/content/dow...ion/N66067.pdf
Hope the above info helps a little, and look forward to your feedback.