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I’ve put a few miles on the coach since replacing the front bags. Since the ping tank is in great shape we just replumbed  with the smaller 3/8” ? lines in place of the large O/E lines. There is not much difference in ride, maybe slightly harsher. We just replumbed the rear in the same way. I don’t have enough miles yet to tell any difference. What you are describing may be mostly a result of worn suspension bushings. Is your coach equipped with slow acting HCVs? I believe they are recommended. I’ve never felt that my coach swayed or leaned excessively.

Appreciate your input, I may be a little bit more sensitive to these things than others or like I said it might be in my mind. 

Not sure on the HCV’s I need to investigate those further. They appear to me to have some age to them and possibly could be original. I was going to take a look at them soon enough.

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Jeff,

Your intuition is right on. The ping tank with the large diameter connection line does increase the air volume which in terms of suspension decreases the spring rate. Going directly from the six pack to the air bags will in theory stiffen the spring rate.

Appreciate the confirmation, understand the concept in my mind but do not have the proper terminology to convey it. I guess going to a smaller line to the ping tank may also be a compromise, I am thinking like a 1/2” line instead of using 1/4” line. Will have to see, not sure when I will be able to get to messing with that, have other fish to fry.