rear leaf spring choices?

Nothing against ESPO, they make great springs.

I'm using AFCO 20231m's on my Duster, they're a 121lb spring that sits pretty much at zero arch. They have a reinforced front section too, kinda like the SS springs and some of the aftermarket handling springs. Only thing about them is they have a 1/2" longer front section, so they center the tires up in the rear wheel houses. Might be good for you, might not. I had my driveshaft made up after I installed them because I switched to an 8 3/4, so it didn't matter.

You can also look at the Mopar oval track springs, part P4529415. Those are the +1" version, although they sit pretty darn flat. Pretty much the same spring as the AFCO's, but you can get them CHEAP...

https://monicattichrysler.com/comersus/store/comersus_viewItem.asp?idProduct=814