Nice story and thanks for sharing, you have traveled down a path that many, including myself, have when starting RVing. Except I never traded in my 3/4 truck, we just bought a bigger trailer!
I would say if the rig sits level, and you have only removed 40 lbs from the steer axle, that's OK. The 50% means you want to restore AT LEAST 50% of the weight removed from the front axle by the weight of the trailer. The idea is that you don't want to have floaty steering and headlights that scan the trees for birds at night. The important thing is that it tows nice and stable.
I also commend you for taking the time to go to the scales and see what's what, it's almost impossible to dial-in a WD setup without the numbers.
If you need to reduce tongue weight and still have GVWR capacity on the trailer, take a look at
this mod.
I would watch out for loading...if your fresh tank is ahead of the axles and you go out full and come home empty, then adjusting the WD on the way home might be a good idea.
At this point, there's only so much you can do....if you like the way it tows, then I would say you're done with the set up, now have fun! BTW, welcome to the forum!
One last comment, watch the trailer tires...you are loaded at 5500 (4920 axles, 580 tongue) against a GVWR of 5955, be sure you have adequate load capacity on the tires as well.
