A little bit of apples and oranges. The geometry of the IFS which Paul and Kevin have cannot be compared to the issues that Eric and Deb had for example unless the IFS coaches have no more or less mechanical advantage in supporting or lifting the coach. This issue makes me want to put gauges on my suspension system just so I know the values of the pressures required to go from full down, to ride height to full up.

In Kevin's case I'd bet his coach will ride and handle closer to what the engineer's designed because Marathon conversions tend to be a little (or a lot) front heavy. Paul likely has a softer ride. I don't think either is dangerous as long as the shocks are in good shape because they tend to dampen the mushiness.